What is the problem you are having with rclone?
There is not a guide how to install Rclone to OMV.
What is your rclone version (output from rclone version)
Which OS you are using and how many bits (eg Windows 7, 64 bit)
OMV 5
Which cloud storage system are you using? (eg Google Drive)
Google Drive, Google photos (Keep original quality of downloaded photos & videos)
The command you were trying to run (eg rclone copy /tmp remote:tmp)
Paste command here
The rclone config contents with secrets removed.
Paste config here
A log from the command with the -vv flag
Paste log here