Hello I just bought a brand new to of the link iMac 2020 and first my first project I'm already having issues. I created a simple banner ad with a video and when I try to do export > Render Video the wheel starts spinning but just stays stuck. I have a brand new iMac with 40 gigs of ram so it shouldn't be a computer issue.
Sorry to hear that Photoshop is not able to render the file. Could you please let us know the version of Photoshop you're on?
Please go to the System Preferences of macOS, then Security and Privacy & select the Privacy tab. Once there, please select Accessibility from the list on the left and add Photoshop to the list by unlocking the window using the lock icon. Also, grant permissions to Photoshop under Full disk access. Once done, restart the computer and let us know if that helps.