No preview thumbnails since allowing OneDrive to auto backup

Since allowing Microsoft to sync backup to OneDrie, my Sketchup model pictorial thumbnails won’t display - only the SU icon. This is really inconvenient when I need to make a quick visual selection for a 3D model in File Explorer. I’ve checked my desktop icons are set to ‘Extra large icons’ and ‘always display thumbnails’ but everytime I save/close a model, the icon only momentarily displays as a pictorial thumbnail of the model, before reverting back to the SU icon. I’m sure this must be to do with OneDrive as the SU models on my removable backup drive are fine. All My other file formats (i.e. PDF, JPG) all display fine as thumbnails. Thanks in advance for any help you can give me!