COPY_FILE_ERROR error condition
Error copying a file.
FAILED_TO_COPY_FILE
Failed to copy the file at path <source> to <destination>. Cause: <cause>.
FILE_ALREADY_EXISTS
A file already exists at the path <path>. Set if_file_exists with the modes "skip" to skip uploading this file, or "overwrite" to overwrite the existing file.
FILE_NOT_EXISTS
The file at path <path> does not exist. Use TRY_COPY_FILE instead, which would return a null for files that don't exist.