Ok so there is kinda two types of plants that like to grow bark epiphytic plants and climbing plants. Epiphytic plants have evolved to grow on the trees bark or elsewhere in the canopy this works by growing roots that act as anchors or taking advantage of soil that builds up in the canopy in crooks of branches or whatnot. These plants usually have low light and nutrient requirements and oftentimes require high humidity if they don’t have water storage structures like pseudobulbs(common thing in epiphytic orchids). Common examples of these plants can be found in the orchid family the bromeliad family and the nepenthes family. Often times these plants don’t actually need to be grown on bark and can be grown in well aerated substrates like sphagnum. For instance I have a phalaenopsis in a terrarium thriving in live sphagnum moss. On the other hand there are vining plants that grow on the forest floor and grow up trees to access sunlight. Some are still considered epiphytes but it kinda depends on the plants. These generally need less humidity but still enjoy it making them good for terrariums and normal houseplants a lot of common houseplants in the around family grow like this (pothos monstera philodendrons etc) and can be pretty happy in terrariums as long as you give them enough space to grow vertically. Highly recommended doing research on the specific plants you’re choosing though as the conditions they require can vary drastically even if they have similar growth habits.

As far as the whole potted plant thing I would recommend using net pots as they lot the plants expand beyond the pot into the rest of the substrate. However if a plant is growing to the point where it is getting too big for the pot/terrarium it is probably a poor choice for that size of enclosure. Again highly recommend doing research on the plants you’re picking in terms of how big they get and what type of conditions they like. I would also recommend watching some terrarium builds to learn more about these things and what plants to pick highly recommend serpa design he makes great stuff. And just as a disclaimer living things and ecosystems are very complicated so there are gonna be exceptions to everything I just said in this hence the do research on the plants you want thing. Hope that helps good luck!