If OneDrive files open as ‘Saved to This PC’ and not on OneDrive, then follow these suggestions to make sure files are saved into the cloud.

To resolve the 'Word cannot open the existing file (Normal.dotm)' error, reset the Normal.dotm file, use Open and Repair, and disable add-ins.

You don't need an expensive Adobe subscription to open Illustrator files. Here's are three free or low-cost alternative ways to open AI files.