I've accepted it as a one-time courtesy, but please post them before the deadline next time. Thank you!
If you're uploading a HEIC file from a phone, I suggest uploading it directly from the phone instead of a computer. This is one of the more common file types that would get this error. If this suggestion doesn't help, you may have to first upload the images to an image hosting site such as Imgur or convert the files to a standard format before uploading them to the forum.@Jeremy I was going to post my finds but keep getting error message that the image file type is invalid?