You're using two obsolete HTML tags, Dan (though as a practical matter browsers will support all tags for all time--they just can't let go). The effects of 'center' and 'font' have been incorporated into the 'style' attribute on each element in the example below:

<p style="align:center;"><img src="https://photos.app.goo.gl/X8Cj1b8qcr8HJZnp6"; style="max-width:600px" /></p>

The outer 'p' tag establishes a container in which to put the image, and centers its content with the 'align' effect in its style. The 'img' tag uses 'max-length' to cap the width of the image to a comfortable size in a post, and the browser will preserve the aspect ratio by sizing the height proportionately.