https://bugs.winehq.org/show_bug.cgi?id=42936
--- Comment #3 from faalagorn@gmail.com --- It seems to be a duplicate of Bug 41917 and the culprit indeed seems to be a file size limit which apparently is 600KB - unfortunately the error message doesn't seem to mention that. Seeing how the attachments here can be up to 5 MB, maybe it would be wise to raise the limit, especially with higher resolutions being popular? To further reduce size, an lossless compression can be performed on PNG, either on user side with command line tools (which can be hinted to user prior to upload), or server side, though it's not a
Also, it would probably be wise to mention at least in the wiki - if the size limit is indeed 600KB and stays that way, it would be wise to state it in the following wiki pages IMHO:
https://wiki.winehq.org/AppDB_FAQ#How_can_I_submit_screenshots.3F https://wiki.winehq.org/AppDB_Maintainer_Guidelines#Screenshots_guidelines
In addition to the screenshot upload website and the error message, to avoid future confusion.