I don’t know what’s worse:
1) The dev that whitelisted .jpg and throws an exception when .jpeg is used.
2) I’m having to educate business users how to rename a file.

The worst part will be when they start renaming .png and .docx files to .jpg and saying that's the process you told them to follow.

When they rename .psd to .png and expect it to work, and wonder why the page now takes longer to load 😞

Well how bout both🤔

@Null-Device It's not just about confusing the program, it's about having to deal with whatever half-baked business process they came up with in your absence. If something like this happened at my work there is a near guarantee that they come up with the idea of renaming a hundred <ridiculous file type> files to .jpg and try to bulk upload them a half hour before their hard deadline to get those images onto the site. The users I have, will literally do the exact opposite of what I told them to do, put it up on their wiki as official process and expect me to bail them out when it doesn't work because they claim it's what I told them to do. Thank god I'm remote and have a written record of 90% of our communications.

I'd fire that developer. Wtf.