Interesting Topic but I would not use a Smart Phone Too Small you will miss details but then again I only do Video and have a Dedicated Laptop I never used online It was purchased strictly for Trail Camera Images. When I check Cards I download all the Images I get if I see something that grabs my Attention I will check that selection once It is done DLLing. But I have only had a Smart Phone for 2 years and It is not worth my time as I want to see details on a 16.5 Screen. Never had any Issues Downloading all at one time and have sometimes over 1K of them mostly over the Winter. For the cost of a Laptop you can get one for a Couple Hundred Dollars some even have an SD Card / Media Slot. Guess I am in the minority. Been using a Laptop since 2016 works for my needs and No issues or troubles.
LFM