As designed Attachment thumbnails are always saved as .jpg

[Kirby]

Affected version

2.1.10

Not really an important bug, but smth. that looks strange (and might cause issues if users download thumbnails and try to process/work with them elsewhere):
Attachment thumbnails are always being saved as .jpg, even though they might be PNG or GIF.

 

[Chris D]

It has always been this way and the same is true for avatars too.

There's no plans to change this.

 

[btmgreg]

Why would you want to download a thumbnail rather than the full/displayed image?

 

[Kirby]

I don't know why users do that

But they do it and at least vBulletin rejects files with "wrong" extensions.