When copying a process with many commits, it is possible that the following error message appears: 

"Could not allocate space for object 'dbo.job_code'.'pk_job_code_job_id_commit_version_id' in database 'ProcessRobotDatabase' because the 'PRIMARY' filegroup is full. Create disk space by deleting unneeded files, dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup."

To resolve this error you have two options; either remove old unnecessary commits (to decrease the Process' size) or increase the database's available size from the SQL Server Management Studio. It is also recommended to first backup the entire ProcessRobotDB database as an additional precaution (to do so kindly consult Microsoft's instructions Create a Full Database Backup - SQL Server)

Afterward, please retry copying your process in Process Robot Studio and it should now work.

For additional information, you can also refer to Free DB space - remove past Process commits.