I will try to explain: Most modern phones and cameras take very large pictures, in terms of megabytes. Trying to email or upload these megabytes takes unnecessary internet bandwidth. The photos can be resized on your local machine or on your phone before you try to send them out. By "resizing" of course you lose quality, but the quality was very good to start with, and if you have not resized them too much it is usually OK. My wife's iPhone had an application running which was copying, sizing and uploading her photos to the "cloud" my wife had no idea it was happening why all the her photos were double and her phone was so slow. Anyway we stopped that menace now.
With modern technology, and especially with Apple, who are the spawns of the devil, and who usually decide for you, it is very easy to lose control of your personal data.
For example back many years ago, I was being asked by almost random people (eg visiting a child's birthday) to see why their computers were not working OK and were so slow. On inspecting those PCs I almost aways discovered them being infested with viruses and trojans, hence why so slow, but also huge amounts of pornographic material, in one case gay men. Imagine me sitting at the PC, trying to fix the computer the dad asked me to, with little children running in and out of the room, and there in all its glory is a gay fest porn mayhem and me trying to hide it from the kids

Lesson: never ever give your PC to anyone.
This forum demands photos of less than 200KB each. In addition if you try to send multiple photos on the same post it keeps rejecting. That is very limiting in my opinion. Eventually I would like to post photos of my large aquarium and ask for advice for what fish to get.