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Hello,
Can you confirm if the account was a Sandbox account by any chance? If so, it will fail with the same error and we can enable the Sandbox checkbox.
On the flip side, you can also try copying your salesforce URL and replacing it in the login UR...
Where do you want to upload the file to. we can use single file upload or file upload(s) option to upload files from REST POST snap provided the endpoint supports uploading file.