We do work with Canva, yes! In regards to other apps, since there are many tools out there (VistaCreate, Offeo, Stencil, etc), the whole team would have to be trained on all of them in case your designer takes a day off, and that wouldn't be realistic.  Right now we only work with Adobe Creative Suite (Photoshop, Illustrator, InDesign, Figma) and Canva, as we have all our processes streamlined.