I bought an OTG cable a while back, but I decided that when I'm "on the go" I'd rather use something more compact. I picked up a couple items that I'm pretty happy with so I thought I'd pass the info along. No affiliate or referral links, just product pages.
Micro SD card reader, for uploading pics from the DSLR and zoom camera: https://www.amazon.com/gp/aw/d/B01A...ag=hawk-future-20&ascsubtag=UUacUvbUpU5023082
Dual A/C flash drive, when I want to copy something to or from my phone and don't have an A to C cable nearby: https://www.amazon.com/gp/aw/d/B010...ag=hawk-future-20&ascsubtag=UUacUvbUpU5023082
Micro SD card reader, for uploading pics from the DSLR and zoom camera: https://www.amazon.com/gp/aw/d/B01A...ag=hawk-future-20&ascsubtag=UUacUvbUpU5023082
Dual A/C flash drive, when I want to copy something to or from my phone and don't have an A to C cable nearby: https://www.amazon.com/gp/aw/d/B010...ag=hawk-future-20&ascsubtag=UUacUvbUpU5023082