Issues with image source from external drive.

I am having issues with an image source in OBS on my iMac. The image I am trying to pull into OBS is stored on an external drive. The image has worked in the past and the source already exists in OBS. OBS will only launch if the external drive is not connected to my Mac. If OBS is already running, it crashes when I connect the drive. I have tried restarting my device and using a different flash drive, neither had any effect. My device is a 2013 iMac currently running macOS Catalina 10.15.7. I am running OBS version 28.1.2. Any suggestions to resolve this issue? Thanks
 
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