Hello, there is a bug with 1.24.6 when interpolating with single images (not video).
When using single images (PNG) you cannot enter anything at all in the FPS fields - not in the input or the output. You cannot type or copy/paste any value.
Since flowframes will not perform interpolation unless an FPS is entered in one/both of these fields, no interpolation can be performed at all when the source used is image files.
The last version that I know worked in this regard was 1.20.4
This issue was also reported by Aboykiy 12 days ago, just with less detail.
Hopefully an easy fix, definitely an essential one.
Also with the same settings, you cannot "select folder" for the input images using the file browser. You can at least copy/paste the input path in the field, but this probably also needs fixing. Selecting the output folder seems to work fine.
My best regards for your otherwise excellent work!