Samsung S7 Downloaded Photos are Corrupt on PC but view OK from Android Gallery. Issue started after Android internal storage got all full
Well it seems perhaps an issue with USB port on my computer CORRUPTING the data!

Still transferring now on a different computer, will update soon with when done.

Edit/Update: I can see photos just fine from this other computer and after I transferred/copied some over usb, I can also open them up fine on the computer.
It says it has 11minutes to go to transfer remaining photos out of total 1590.