When sending a clip to an external audio process, it appears that if the clip has any Fx on it (VST/AU), the resulting file in Izotope appears to be a brick comprised of one-sided DC offset.
On a clip without any Fx, the file shows up fine and the round trip process works without any issue.
This is on a 44.1kHz Timeline with Flexbus. Resolve 17.2.2, Izotope Advanced 8.1.0.544
See image.
Screen Shot 2021-07-07 at 21.09.49.png