My .tif files are scans of 35mm film negatives. Photoshop Elements 2020 used to allow me to drag and drop these images to edit but now I get a message :
Could not complete your request because Photoshop Elements does not recognize this type of file.
As this was working fine until now I deleted Elements and reinstalled. I was even offered a package update which I also installed. This has unfortunately not solved the problem. It does accept JPEG files.
All I could find on line was information regarding RAW files but not .tif
Although I don't think I have seen this with Elements, I have had the experience with other programs where a .tif file will not be recognized, but a .tiff file will be (or vice versa). Changing the file extension will sometimes fix the problem. I don't know if it will for you but it's worth a try.
I'm also going to ping @Jeff Arola who knows more about this subject than I do. Perhaps, he can offer some suggestions.