Soundly support:

How can I index private sound effects in my local Soundly library?

You can index sound effects from your computer, external storage device, or your local network by dragging and dropping file(s) or folder(s) over Soundly. This does not mean that you physically upload the files; it means that Soundly indexes them to the search function, so they are easy to locate, along with the sound effects from the Soundly Pro library. If you have your sound effects stored on an external storage device, you’ll still need to have this connected to your computer.

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