Scratch disk full error despite having free SSD storage space

​@Pritu2 

 

Check for APFS local snapshots — that's almost always the culprit when Finder shows free space but apps still choke on "disk full." Snapshots pin old blocks even after you delete files.

Terminal:

tmutil listlocalsnapshots /

If you see a list, that's your problem. Thin them with:

tmutil thinlocalsnapshots / 50000000000 4

(bumps up to ~50GB purgeable, adjust the number)

Or in Disk Utility: select the volume, hold Option, File > Show APFS Snapshots — you can delete them one by one there too.

post this in the ps forum, https://community.adobe.com/p/photoshop

p.s. change your title to avoid a duplicate message problem.