Photoshop: Not a valid Photoshop document
My daughter has been using 2019 Photoshop CC, updated to 2020. She is a novice, I don't know even less about Photoshop I'm afraid, so please :) bear with me... She inadvertently deleted a Photoshop file with "a lot of layers" from her computer...permanently. We used a recovery program and have managed to recover what looks to be the file, though when she tries to open, gets the error message Could Not Open because it is not a valid Photoshop document. We have looked around the internet and tried a few things (like changing the file extension to TIFF and pdf), but so far no luck. The file is 9.57 MB. I am willing to upload somewhere if anyone is up for troubleshooting. Please help, she is desperate!