Once your 7-day Premium trial expires, you will lose access to Premium features (see the Premium Only sections in https://www.odrive.com/upgrade), but retain all of the free features.
For a comprehensive list of Free and Premium features, take a look at this post: What is free vs paid (premium)?
For the following Premium features, there are a couple things you should take note of… also, this is one reason why we provide trial expiration warnings in the desktop client as a friendly reminder:
You will lose the ability to modify Encryptor folders, but you will still have the ability to browse and download from them.
Sync to odrive:
You will lose your “sync to odrive” sync configuration, so your files will no longer sync. However, any files you had previously synced will still exist in your remote folder location; we don’t delete any files that have already synchronized. If you later upgrade, you’ll have to set up your folders outside of the odrive folder to “sync to odrive” again. The default odrive folder will not be affected.
Obviously, we hope you like the Premium features enough that you’ll upgrade. =) In case you don’t, we won’t leave you in a helpless situation.