When running a Flow with a Google Drive Upload File Card, it gets stuck in a permanent loading state, and after a long time, it will provide the following error: 

Invalid input for '"string"' 
"code": 500,

 

• Invalid input for a string
• Workflows
• Google Drive Upload File Card

There are two reasons why this error might occur:

• The account that was used to create the Connection from Workflows and Google Drive is not added as a Shared Member of the Folder where the File will be uploaded.
• In the Google Drive Folder where the file was uploaded, the account's permissions are not set as Editor. They are set as Viewer or Commenter.

The solution for the Issue is to check if the Connection Account has Access to the folder and give them the Editor Permission so the flow can upload the file.