Need Fiber

[peaslee]

I cannot get ants to cut fiber even with the right trail.

[RiO]

You don't only need to use the right type of trail, but also the right type of ant.
E.g. small ant workers cannot cut fiber.
Neither can depleted pod workers.

[Kasima]

Exactly you need at least a Ant Worker, which you can get by merging two small ants in the combiner.

[Fenix]

If you click on a ant, it tells you what it can do.
for Fiber You need Plant Cutting
https://steamcommunity.com/sharedfiles/filedetails/?id=3440893436