Do you have the same issue with Firefox in Troubleshoot Mode?

I can upload an image to a seller via a message, but in your screenshot it looks a little different. Provide steps to replicate your process. What OS? What Desktop? X11 or Wayland?

Operating System: openSUSE Leap 15.6 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.12 Kernel Version: 6.4.0-150600.23.14-default (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 PRO 6850HS with Radeon Graphics Memory: 62.1 GiB of RAM Graphics Processor: AMD Radeon Graphics Manufacturer: HP Product Name: HP EliteBook 865 16 inch G9 Notebook PC

Thanks for the reply Jon, Seems it might have been an eBay issue as I just tried it again now and it worked ok with FF-ESR, even though I'm posting this from Brave. It allowed me to upload the images without any problems. Same seller same images, no settings changed either in FF or on eBay. Didn't try switching it to Troubleshoot mode, though if it happens again I will try that. I did notice that eBay sent my original message to the seller 3 times when I only clicked Send once when I was having the problems, I did try 3 times to add the images to the original message when getting the popup message about Google preventing it. Cheers

MX-Linux 21.3_x64 Xfce 4.18.1 X11 server: X.Org 1.20.11

Glad to hear... Carry on soldier.  ;-))