@KA Welcome to Microsoft Q&A FOrum, Thank you for posting your query here!
Right, it is safe to delete it.
$RECYCLE.BIN is a system folder where deleted files are stored. If it is deleted, either deleted data will be lost or a new $RECYCLE.BIN will be created. It will not have any impact on data upload or our workflow.
We ignore it during upload. So, it will not affect upload in anyway. $RECYCLE.BIN will re-appear if you delete files / folders from the disk.
Please let us know if you have any further queries. I’m happy to assist you further.
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.