I’ve been using my iPad,ManyCam, and Zoom for playing online. ManyCam is a studio app that allows the iPad screen to show up on Zoom as a virtual webcam. I use the Procreate app to draw in layers that I reveal by usig a clipping mask (an opaque layer that can be erased to reveal the layers underneath.) There is a Drawing Guide feature in Procreate that looks like graph paper, which I use as a base layer.
I don’t use a VTT yet (Looking at you, Runehammer) but since all ranges are Near, Far and Nope, it works just fine. Once I figure out how, I’ll post some maps.