"Download (no annotations)" doesn't download snapshot attachment

[AbeJellinek]

Just opens it in a new tab, since it isn't served with Content-Disposition: attachment.

[tnajdek]

I don't think this can be fixed in the web library and would indeed require a header.

@dstillman would it be feasible to add Content-Disposition header to files served from files.zotero.net?

[dstillman]

It's not specific to snapshots. "Download (no annotations)" doesn't download for PDFs either.

How are we triggering downloading for regular "Download" for PDFs?

[tnajdek]

How are we triggering downloading for regular "Download" for PDFs?

We fetch the file, use PDF Worker to convert Zotero annotations into PDF annotations, and serve the produced blob using an a element with the download attribute, which is clicked via JS (at least in most cases - we rely on an npm module that handles various quirks in different browsers). However, this approach has limitations, such as the maximum blob size and a delay (when you click a "Download" button, a spinner appears).

Unfortunately, the download attribute only works for same-origin URLs (as well as blob: and data: URLs). Since the file is hosted at files.zotero.org, the download attribute will be ignored.