Well…I’ll make an attempt at this one…Is there a way to post thumbnails instead of fullsize pics (that take up all the screen)? I haven't found such function.

Thanks, but I only see "Full image" as on option.Well…I’ll make an attempt at this one…
View attachment 111267
Note the row of thumbnail images across the bottom. In the image furthest to the left I have clicked the area that had previously said “insert…”(as appears in the rest of the row). Now one is able to choose between posting the thumbnail or the full image.
These thumbnails appear at the bottom of the post as images are added, and the choice can be made, during the process of making the post…or when editing, after the fact.
I hope this helps.

Perhaps because I’m using Safari on a tablet, most of the time, it shows differently for me. Sorry for the dead end.
Plus with Imgur you don't need to resized your photos. If it posts really big and you want it smaller you just edit your post, click on the image and you can drag a corner to resize it right there. Then if anyone what's to see it full size all they have to do is click on it.
example: click image to make it bigger, click again for full size.
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