Synology DS1522+ Expert Needed — Make Third 8TB Drive Usable While Preserving Existing Data

Hi, I’m looking for an experienced Synology specialist to help with my existing Synology DiskStation DS1522+ five-bay NAS. I’m a video creator and use it to store important footage. The NAS is already set up and working, but my current storage is full... (Budget: $30 - $250 USD, Jobs: Data Backup, Data Recovery, Documentation, System Administration, Technical Support, Troubleshooting)