My pics disappeared from phone 😔

So, the pictures have gone from the phone, which I can understand as that can happen, but also two folders of pics have gone from the computer, despite being merely a manual backup (and therefore not susceptible to accidental deletion from the other end) and no-one actually deliberately removing them? I hate to say it, but the lack of proper backup up to this point means that they are probably gone forever. Start using Google photos to backup from now on to make sure this doesn't happen again. In my experience though Android phones have prompted me to use Google backup for a good number of years now, so when they prompt you to do it it's best to do so, unless you have another method in mind at the time.

Have you tried Samsung recover?
Settings - Clouds and Accounts - Backup and Restore
Is backup my data enabled?

There is another to restore data.

I lost my phone a few months back, new Samsung purchased, restored my data and it was back to normal - photos (minus recent ones) , settings etc. Could try that.