It isn't easy and is difficult to explain and even more difficult because what will work best for you does seem to depend on what device you are using and whether it is Android or iPhone.
The laptop way MusselMan has described is different to what I see when I post photos which I do from my phone which is an Android.
If you are doing a report I suggest you give it a title, then type a few words of the report
Then either be brave and carry on
or
save it and then go back into it using the edit button.
Above the white box you are typing in you will hopefully be seeing two lines of little "things" on my phone top left is a capital B ( that is the Bold typeface option)
On my phone beneath the B is a picture that looks like a Polaroid instant photo with a square computer disc on its corner
Click on the one I've just described,
a page pops up on my phone screen with something like "select file" on it
I click on those words and choose the photo I want,
After this point it's similar to MusselMan's description.
Remember to save at the end, you can always edit it if you need to.
Don't get too ambitious
on the first go!
On a phone screen you'll probably find that sometimes popups are off to the side & not fully in view
or the "save "button is covered up, so you might need to use your finger to slide stuff about
When doing a report with multiple pics I tend to draft it in a section only we moderators have access to and then move it to the sections you see when I am ready - even then I often see something I want to change and edit it.
I am wondering if we could create a drafting area for people to use and then transfer finished reports from when done.
Have a go at adding a pic to this thread here, good luck!
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we call it fishing not catching!