P: Saving copy not saving over jpg file

The best option right now for MAC users is to use the Export function. Its a relief once you use it! File> Export >> Export As..

I hope this helps you guys reduce some of that annoyance.
TC

Yes. Please, someone, figure out a fix. This is so annoying and super time-consuming!

Thanks for the update Elizabeth, sorry it quit working for you too.  Fingers crossed that Adobe fixes this soon.  

Same issue. This issue appeared after software updated to release 21.0.2. Very Frustrating.

Yep, totally stopped working after 1 day. What the f***! He didn't seem concerned about the issue at all, just screenshared my computer, made the change, and that's that. I thought I had overlooked this simple fix the whole time. Ugh.

I think this could actually be a Mac issue. I have the latest version of PS on both my Windows PC and my Macbook and I don't have the issue when overwriting an already saved JPEG file on my PC. My only work around so far has been to do a Quick Export as JPG.

Same.

I wrote to Adobe Support the following:

1. Create test.psd file
2. Save test.jpg
3. Make changes and try to rewrite test.jpg you've created on step 2
4. Dialogue window appears that says: '... replacing it will OVERWRITE its current contents'.
5. Click 'replace'
6. Creates 'test copy.jpg' and not overwrites current contents

Expected: overwrite old file with the new one
Bug: Creates new file 'test copy.jpg'

They say it's a known issue, and pointed me to this thread. That's all, folks.

Hi Elizabeth, Did Adobe say that they are working to fix this?  

I tried this, worked for a day and even though the permissions have remained, the save quit working again.  so frustrating!  good luck tho.