Posting / adding pictures

Nov 5, 2019
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Hi folks,
Sorry if this has been discussed in the past - I couldn't find my specific issue.
When I click on "attach files" either in an album, or in a post, the picture will "upload" but won't appear as a tab, and when I try to post, nothing shows up.
Your help would be appreciated. (I'm on my Macbook, and am not technologically advanced. :) )
Right above where you type, there is a chain icon(insert link) and smiles icon. Hover over the icon in between and it'll say insert image (ctrl-p). It'll let you add a picture.

Hope this helps!
Thank you!
Tried a few - all were too large - what are the size requirements? I can try to change the size ? ?