Unable to restore attachments

Hello again,

I tried restoring a document and its attachments only to realize it doesn’t work.

I imported the .grist file (20,8 MB), went to “Parameters” page and tried to upload the .tar file (2,27 GB). All I get is this:

I dowloaded a second copy of the .tar from the original document, but ended up with the same result.

I stumbled upon this while troubleshooting a printing issue. So there’s no panic at the moment, but I suddenly feel I won’t sleep as well as I used to from now on.

Is there a file size limit or somehting?
Where to look for logs related to that?