There are many different names for this quad, I k ow it as the eachine e50. I only.used it on android before but do recall the app not being the best, with it crashing. So my o ly suggestion is maybe try restart your drone and try calibrate it before you fly. I think the led change when you start to calibrate, but the app does not provide any feedback.
For the manual, here is one I found in digital form that you can atleast zoom into: