Hi Thiago_ferrari,
If custom activities are not available you can leverage existing google api using http request activity of uipath web activities package. It works just like postman tool.
I am also facing a similar issue where I need to update the description of a file on Google Drive. I tried using HTTP request but it needs a separate token.
The HTTP request won’t work that way because it doesn’t automatically inherit the authentication from the Gsuite scope. If you want to use HTTP request, you will have to authenticate it separately.
In the scenario below, you could try setting the JSON key location in the “Client Certificate” field.
I think the easiest way would be to use the UiPath.GSuite.Activities package and use the “Find Files and Folders” activity inside a GSuite Application scope. You could make a query that returns all files in the specified folder.