Hi @Colossum12,
I went through the thread and my best understanding of what happened is that you are using a different account from the one you used to create your files. We use a folder with a unique code to store your files in and that code is tied to your username.
So for example, the code for one of my accounts is BEN7K8MYHA8Z and another of them is 9HZFNPCQHGYW. On my Windows machine, I have folders with these names that are stored in C:\Users\sattas\AppData\Local\Autodesk\Autodesk Fusion 360\.
Do you see two or more such folders in a corresponding location on your machine?
What is the name of the folder you found your files in? We could try to figure out which username that account was related to (I am not 100% sure if this is possible but I can ask some colleagues).
Another solution would be upload the files into Fusion directly from that folder by selecting each one. So in my example, I could select the upload button in fusion and pick the file C:\Users\sattas\AppData\Local\Autodesk\Autodesk Fusion 360\9HZFNPCQHGYW\W.login\F\Lock Pin.5db153f0-1654-47dd-bd5e-f787136d729e.f3d
But if you have a lot of files, this would be time consuming.
Could you also send your diagnostic files to saket dot satta at autodesk dot com. We could potentially find some useful information there.
Thanks,
Saket Satta
Fusion 360 Engineering
