Hey Nick, wanted to reach out and thank you. A few months ago I got interviewed for a job and needed to beef up my portfolio to impress. I ended up spending 3 practically sleepless nights binging your, and Ben Marriott's, educational content. Your work pretty much saved my ass and got me the job I have now, thank you so much.
Hi, I just found your channel. Great content. An easy way to do this is to generate the animation in Mixamo in place and then you just animate the stairs. When in blender you press (Shift E) while the cursor is hovering over the playback section and select Make cyclic.