Under "Edit Clip" your first option available is "Apply Filter". Following the steps below will allow you to easy apply filters made in Polarr Photo Editor.
1. Apply Filter
Under "Edit Clip" your first editing tool is "Apply Filter". Select that tool, to be lead to multiple filter packs, and the option to import or scan your own filters from Polarr Photo Editor.
To add your own filters, select the "+" in the top right corner. You'll be directed to scan or import your own filters.