Downloaded the heic files, converted, and uploaded here. If users will upload jpegs everyone will be able to view them on almost any system/OS. Apple product users can set their devices to save files as jpeg/jpg avoiding all these issues. It takes a lot of time for me to do this conversion, lots of hassles with incompatible files and applications. This will be the last file conversions I will do. I will put a pinned thread in the Computer Help Forum.
https://leatherworker.net/forum/topic/98380-heic-picture-files-convert-to-jpeg-before-posting/