Enhancement: Ability to show thumbnails instead of full images on profile pages
Currently Image file-type profile fields are displayed at full-size on the profile pages. The ability to show a thumbnail(or other image size) that leads to the full image on click, can help make the profile page layouts consistent.
Member directories has its own special function to display a file type preview: https://github.com/strangerstudios/pmpro-member-directory/blob/dev/pmpro-member-directory.php#L127-L143
Core PMPro 3.0+ has a new file type preview version we use in the pmpro_member shortcode: https://github.com/strangerstudios/paid-memberships-pro/blob/v3.0/shortcodes/pmpro_member.php#L179-L189
We should update Member Directory to use the new way for file field preview as it works in v3.0.
This is going to be resolved in the next Member Directory release as we are now using all PMPro v3.0+ functionality to display files.