You can use the image template to customize how you image attachments are displayed.
So this accepts my own html tags in the block? Align tags are not in the listed code, which is why I asked and I couldn’t really find it in the documentation. Did I miss something?
I tried adding this align tag and now it just doesn’t post at all once the email hits the site and creates a bunch of temp posts stuck, so apparently that’s not correct. I would be very grateful for an actual example of this that works.
Here is what I tried.

I don’t see anything wrong with your template
<a href="{PAGELINK}" rel="nofollow ugc"><img decoding="async" loading="lazy" src="{MEDIUM}" alt="{CAPTION}" width="{MEDIUMWIDTH}" height="{MEDIUMHEIGHT}"></a>
Please install the support addon and follow the instructions for collecting and sending logs.
https://postieplugin.com/downloads/support-addon/
After upping my PHP memory limit, I have it posting again but adding align=”{CENTER}” doesn’t center it.
That is because align=”{CENTER}” isn’t a thing.
Change your template to look something like:
<p style="text-align:center;"><img src="{MEDIUM}" /></p>
Ah, I only wanted to center align the image under the text, not the text… will that also cause my text to center?
Apparently I can just center the image in the body of the email and that works, because the tagging doesn’t seem to make any difference, thanks for the help today .