How to save editable pdf on my phone without losing fields?

I filled out a form PDF on my Android phone, but when I save it the fields go flat and can’t be edited anymore. How do I keep it fillable?

had the same thing last month. phones usually flatten the fields when you save, tbh i just email it to myself and do it on my laptop. if you’re stuck on android try google drive and save a copy from there. not sure it always keeps them fillable but that’s what i’d try.