diff --git a/lib/s3.js b/lib/s3.js
index c8f2e2c..7a9e61d 100644
--- a/lib/s3.js
+++ b/lib/s3.js
@@ -17,8 +17,11 @@ const {
   createWriteStream,
   readdir,
   ensureDir,
+  stat,
 } = require("fs-extra");
+const AWS = require("aws-sdk");
 const path = require("path");
+const MB = 1024 * 1024;
 
 // https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-keys.html
 const maxFileNameLength = 1024;
@@ -69,6 +72,7 @@ class Bucket {
   }) {
     let configuration = {
       forcePathStyle,
+      s3ForcePathStyle: forcePathStyle,
     };
 
     if (!bucket) {
@@ -84,6 +88,7 @@ class Bucket {
     }
     if (region) configuration.region = region;
     this.client = new S3Client(configuration);
+    this.configuration = configuration;
   }
 
   async stat({ path }) {
@@ -137,23 +142,64 @@ class Bucket {
       );
     }
 
-    const uploader = new Upload({
-      client: this.client,
-      queueSize: 4, // optional concurrency configuration
-      leavePartsOnError: false, // optional manually handle dropped parts
+    let chunkSize = 5 * MB;
+    if (localPath) {
+      let fileStat = await stat(localPath);
+      const desiredChunkSize = await Math.ceil(fileStat.size / 10000);
+      // at least 5MB per request, at most 10k requests
+      const minChunkSize = Math.max(5 * MB, Math.ceil(fileStat.size / 10000));
+      chunkSize = Math.max(desiredChunkSize, minChunkSize);
+    }
+
+    let uploader = V2MultipartUpload.bind(this);
+    let response = await uploader({
       params: uploadParams,
+      partSize: chunkSize,
     });
+    return response;
+
+    async function V3SinglePartUpload({ params }) {
+      // Straight up V3 upload - not multipart
+      const command = new PutObjectCommand(uploadParams);
+      let response = await this.client.send(command);
+      return response.$metadata;
+    }
+
+    async function V3MultipartUpload({ params, partSize }) {
+      // V3 multipart uploader - doesn't work
+      //  https://github.com/aws/aws-sdk-js-v3/issues/1814
+      const uploader = new Upload({
+        client: this.client,
+        partSize,
+        queueSize: 4, // optional concurrency configuration
+        leavePartsOnError: false, // optional manually handle dropped parts
+        params,
+      });
 
-    // uploader.on("httpUploadProgress", (progress) => {
-    //   console.log(progress);
-    // });
+      uploader.on("httpUploadProgress", (progress) => {
+        console.log(progress);
+      });
 
-    const response = await uploader.done();
+      const response = await uploader.done();
+      return response.$metadata;
+    }
 
-    // const command = new PutObjectCommand(uploadParams);
-    // let response = await this.client.send(command);
+    async function V2MultipartUpload({ params, partSize }) {
+      // V2 multipart uploader
+      AWS.config = this.configuration;
+      const uploader = new AWS.S3.ManagedUpload({
+        partSize,
+        params,
+      });
+      // uploader.on("httpUploadProgress", (progress) => {
+      //   console.log(progress);
+      // });
 
-    return response.$metadata;
+      let response = await uploader.promise();
+      return {
+        httpStatusCode: 200,
+      };
+    }
   }
 
   async download({ target, localPath }) {
diff --git a/package-lock.json b/package-lock.json
index 9afa1b7..c172091 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
         "@aws-sdk/client-s3": "^3.9.0",
         "@aws-sdk/lib-storage": "^3.9.0",
         "@aws-sdk/s3-request-presigner": "^3.9.0",
+        "aws-sdk": "^2.872.0",
         "fs-extra": "^9.1.0",
         "hasha": "^5.2.2",
         "lodash": "^4.17.21",
@@ -4084,6 +4085,67 @@
         "node": ">= 4.5.0"
       }
     },
+    "node_modules/aws-sdk": {
+      "version": "2.872.0",
+      "resolved": "https://registry.npmjs.org/aws-sdk/-/aws-sdk-2.872.0.tgz",
+      "integrity": "sha512-hI1/iwR1uPbuulvWZmCCmLKN1Oiv+Beutwcn+7ZOsWAEtsgsXiHmuRDS/ZdWiBRNQkfZgUhcCwLz7nOrWKpb8w==",
+      "dependencies": {
+        "buffer": "4.9.2",
+        "events": "1.1.1",
+        "ieee754": "1.1.13",
+        "jmespath": "0.15.0",
+        "querystring": "0.2.0",
+        "sax": "1.2.1",
+        "url": "0.10.3",
+        "uuid": "3.3.2",
+        "xml2js": "0.4.19"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/aws-sdk/node_modules/buffer": {
+      "version": "4.9.2",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-4.9.2.tgz",
+      "integrity": "sha512-xq+q3SRMOxGivLhBNaUdC64hDTQwejJ+H0T/NB1XMtTVEwNTrfFF3gAxiyW0Bu/xWEGhjVKgUcMhCrUy2+uCWg==",
+      "dependencies": {
+        "base64-js": "^1.0.2",
+        "ieee754": "^1.1.4",
+        "isarray": "^1.0.0"
+      }
+    },
+    "node_modules/aws-sdk/node_modules/ieee754": {
+      "version": "1.1.13",
+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.13.tgz",
+      "integrity": "sha512-4vf7I2LYV/HaWerSo3XmlMkp5eZ83i+/CDluXi/IGTs/O1sejBNhTtnxzmRZfvOUqj7lZjqHkeTvpgSFDlWZTg=="
+    },
+    "node_modules/aws-sdk/node_modules/punycode": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
+      "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0="
+    },
+    "node_modules/aws-sdk/node_modules/sax": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.1.tgz",
+      "integrity": "sha1-e45lYZCyKOgaZq6nSEgNgozS03o="
+    },
+    "node_modules/aws-sdk/node_modules/url": {
+      "version": "0.10.3",
+      "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
+      "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ=",
+      "dependencies": {
+        "punycode": "1.3.2",
+        "querystring": "0.2.0"
+      }
+    },
+    "node_modules/aws-sdk/node_modules/uuid": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+      "bin": {
+        "uuid": "bin/uuid"
+      }
+    },
     "node_modules/aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
@@ -5412,6 +5474,14 @@
         "node": ">=6"
       }
     },
+    "node_modules/events": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/events/-/events-1.1.1.tgz",
+      "integrity": "sha1-nr23Y1rQmccNzEwqH1AEKI6L2SQ=",
+      "engines": {
+        "node": ">=0.4.x"
+      }
+    },
     "node_modules/exec-sh": {
       "version": "0.3.4",
       "resolved": "https://registry.npmjs.org/exec-sh/-/exec-sh-0.3.4.tgz",
@@ -7332,6 +7402,14 @@
         "jetify": "bin/jetify"
       }
     },
+    "node_modules/jmespath": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/jmespath/-/jmespath-0.15.0.tgz",
+      "integrity": "sha1-o/Iiqarp+Wb10nx5ZRDigJF2Qhc=",
+      "engines": {
+        "node": ">= 0.6.0"
+      }
+    },
     "node_modules/joi": {
       "version": "17.4.0",
       "resolved": "https://registry.npmjs.org/joi/-/joi-17.4.0.tgz",
@@ -9883,8 +9961,7 @@
     "node_modules/sax": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
-      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
-      "peer": true
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
     },
     "node_modules/saxes": {
       "version": "5.0.1",
@@ -11393,11 +11470,19 @@
       "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
       "dev": true
     },
+    "node_modules/xml2js": {
+      "version": "0.4.19",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.19.tgz",
+      "integrity": "sha512-esZnJZJOiJR9wWKMyuvSE1y6Dq5LCuJanqhxslH2bxM6duahNZ+HMpCLhBQGZkbX6xRf8x1Y2eJlgt2q3qo49Q==",
+      "dependencies": {
+        "sax": ">=0.6.0",
+        "xmlbuilder": "~9.0.1"
+      }
+    },
     "node_modules/xmlbuilder": {
       "version": "9.0.7",
       "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
       "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0=",
-      "peer": true,
       "engines": {
         "node": ">=4.0"
       }
@@ -15089,6 +15174,63 @@
       "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
       "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg=="
     },
+    "aws-sdk": {
+      "version": "2.872.0",
+      "resolved": "https://registry.npmjs.org/aws-sdk/-/aws-sdk-2.872.0.tgz",
+      "integrity": "sha512-hI1/iwR1uPbuulvWZmCCmLKN1Oiv+Beutwcn+7ZOsWAEtsgsXiHmuRDS/ZdWiBRNQkfZgUhcCwLz7nOrWKpb8w==",
+      "requires": {
+        "buffer": "4.9.2",
+        "events": "1.1.1",
+        "ieee754": "1.1.13",
+        "jmespath": "0.15.0",
+        "querystring": "0.2.0",
+        "sax": "1.2.1",
+        "url": "0.10.3",
+        "uuid": "3.3.2",
+        "xml2js": "0.4.19"
+      },
+      "dependencies": {
+        "buffer": {
+          "version": "4.9.2",
+          "resolved": "https://registry.npmjs.org/buffer/-/buffer-4.9.2.tgz",
+          "integrity": "sha512-xq+q3SRMOxGivLhBNaUdC64hDTQwejJ+H0T/NB1XMtTVEwNTrfFF3gAxiyW0Bu/xWEGhjVKgUcMhCrUy2+uCWg==",
+          "requires": {
+            "base64-js": "^1.0.2",
+            "ieee754": "^1.1.4",
+            "isarray": "^1.0.0"
+          }
+        },
+        "ieee754": {
+          "version": "1.1.13",
+          "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.13.tgz",
+          "integrity": "sha512-4vf7I2LYV/HaWerSo3XmlMkp5eZ83i+/CDluXi/IGTs/O1sejBNhTtnxzmRZfvOUqj7lZjqHkeTvpgSFDlWZTg=="
+        },
+        "punycode": {
+          "version": "1.3.2",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
+          "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0="
+        },
+        "sax": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.1.tgz",
+          "integrity": "sha1-e45lYZCyKOgaZq6nSEgNgozS03o="
+        },
+        "url": {
+          "version": "0.10.3",
+          "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
+          "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ=",
+          "requires": {
+            "punycode": "1.3.2",
+            "querystring": "0.2.0"
+          }
+        },
+        "uuid": {
+          "version": "3.3.2",
+          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+          "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
+        }
+      }
+    },
     "aws-sign2": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
@@ -16145,6 +16287,11 @@
       "integrity": "sha512-i/2XbnSz/uxRCU6+NdVJgKWDTM427+MqYbkQzD321DuCQJUqOuJKIA0IM2+W2xtYHdKOmZ4dR6fExsd4SXL+WQ==",
       "peer": true
     },
+    "events": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/events/-/events-1.1.1.tgz",
+      "integrity": "sha1-nr23Y1rQmccNzEwqH1AEKI6L2SQ="
+    },
     "exec-sh": {
       "version": "0.3.4",
       "resolved": "https://registry.npmjs.org/exec-sh/-/exec-sh-0.3.4.tgz",
@@ -17648,6 +17795,11 @@
       "integrity": "sha512-JNAkmPeB/GS2tCRqUzRPsTOHpGDah7xP18vGJfIjZC+W2sxEHbxgJxetIjIqhjQ3yYbYNEELkM/spKLtwoOSUQ==",
       "peer": true
     },
+    "jmespath": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/jmespath/-/jmespath-0.15.0.tgz",
+      "integrity": "sha1-o/Iiqarp+Wb10nx5ZRDigJF2Qhc="
+    },
     "joi": {
       "version": "17.4.0",
       "resolved": "https://registry.npmjs.org/joi/-/joi-17.4.0.tgz",
@@ -19770,8 +19922,7 @@
     "sax": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
-      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
-      "peer": true
+      "integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw=="
     },
     "saxes": {
       "version": "5.0.1",
@@ -21002,11 +21153,19 @@
       "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
       "dev": true
     },
+    "xml2js": {
+      "version": "0.4.19",
+      "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.19.tgz",
+      "integrity": "sha512-esZnJZJOiJR9wWKMyuvSE1y6Dq5LCuJanqhxslH2bxM6duahNZ+HMpCLhBQGZkbX6xRf8x1Y2eJlgt2q3qo49Q==",
+      "requires": {
+        "sax": ">=0.6.0",
+        "xmlbuilder": "~9.0.1"
+      }
+    },
     "xmlbuilder": {
       "version": "9.0.7",
       "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
-      "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0=",
-      "peer": true
+      "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0="
     },
     "xmlchars": {
       "version": "2.2.0",
diff --git a/package.json b/package.json
index 88badcb..dc39a34 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
     "@aws-sdk/client-s3": "^3.9.0",
     "@aws-sdk/lib-storage": "^3.9.0",
     "@aws-sdk/s3-request-presigner": "^3.9.0",
+    "aws-sdk": "^2.872.0",
     "fs-extra": "^9.1.0",
     "hasha": "^5.2.2",
     "lodash": "^4.17.21",