I'm still read through the 7+ pages is comments here - but to chime in re : my own experience, I'm on a Microsoft computer and saving to the local HD and have been having the same issue all week - including resulting in a corrupt file now today. Very frustrating.
Hi @Mallory5FE2 ,
Sorry to hear about your damaged file. Please follow the information at https://community.adobe.com/t5/photoshop/photoshop-freezing-at-99-when-saving-file/m-p/11651448#M491185
This should resolve the problem. If you are saving to local disk then the small files have used up all your memory and your virtual memory is not sufficient to manage the files. Follow the instructions for the settings suggested and remove files you are finished with or not working with to an external drive.
Best wishes
JG
Photographer and Nutrition Author