Are you using a SD Card as extra storage on your laptop but OneDrive or Dropbox won’t let you relocate your data there?
Here’s a solution for you.
Right click on the flash/thumb drive, select Change Drive Letter and Paths…
Select add, then select Mount in the following empty NTFS folder, browse to your C:, select New Folder…
Name the folder SD Mount > OK > OK > OK
Then Close Computer Management
You can now access your flash/thumb drive through its removable storage location (drive letter) or through the mounted location (C: DB Mount).
Dropbox and OneDrive require a local drive (the mounted volume).