Write Permissions Error in Photoshop 22.4.2 when using Save for Web but not when using Export As

I've been having this issue for monthes on my work computer and its been driving me nuts and I finally found the issue!

If you use Dropbox on MacOS you need to turn off the "Backup This Mac" feature. Dropbox blocks Adobe apps from accessing the files and folders it needs.

I found the solution through the After Effects community who spotted the issue first. Here's the full guide:
https://aescripts.com/knowledgebase/index/view/faq/dropbox-macos-warning/

Super simple and after a restart, I was able to exports GIFs through Save for Web!

I am having this same issue today and nothing is fixing it.

Hi,

We're sorry about the trouble with Photoshop while trying to use Save For Web. Would you mind telling us the exact macOS version you're running?

Please ensure that Photoshop has the necessary permissions on your Mac using the steps mentioned below:

1. Go to the System Preferences for your Mac, then Security and Privacy, then select the Privacy tab.

2. Then select Accessibility from the list to the left & check if Photoshop is added to the list with a check mark in front of it.

3. If Photoshop is not a part of the list, please add it by unlocking the window first using the lock at the bottom left, then clicking the + icon & navigating to the Applications folder.

4. Also, grant permissions to Photoshop under Full disk access located in the same list as Accessibility.

5. Once done, restart the Mac & check if it helps.

If the issue persists, you can try running the script to repair permissions mentioned here: https://helpx.adobe.com/lightroom-classic/kb/lightroom-basic-troubleshooting-fix-most-issues.html

Let us know how it goes!

Regards,

Nikunj