Quote:
I have no idea where you got....
i think that's a temp location used by macOS Photos...
Try this:
Open Photos on your Mac.
Find the pic you want to upload and click it to select it.
At the top of the screen, click File, then select Export.
In the export window select:
Photo kind or type as: JPEG
quality: Medium
Don't worry about size for now...
Click Export... you should have to choose a location to export the file to...
Select Desktop as your export to location and click Export.
That should leave you with a .jpg file sitting on your Desktop.
Select upload image on the forum and select that file you exported that is sitting on your desktop.
it's worth a shot