There are simple solutions to handle EXIF orientation e.g.

It is also alluded to in a FAQ question that WikiTree is not “sophisticated” enough to “know” the correct orientation without referencing that this is right in the EXIF data that is not being handled. I only found this exact issue alluded to in one of the answers to this question. Select the Exif tab, go to the Image section and find Orientation: 4. How edit orientation meta tag in Exif Pilot: 1. In this process, no re-encoding is required.

Given the ubiquity of mobile these days this should be fixed as not everybody has the means or the time to upload every picture to desktop and edit the photo manually to the format and orientation WikiTree expects when most online photo uploads handle such images correctly as expected. The other way to change orientation is to change EXIF metadata of a photo. Worse, the EXIF data is completely stripped so if you attempt to download the “original” full size image it is not recovered and the orientation is still wrong. The same images uploaded to sites that handle this data correctly such as imgbb (or any major website) will display with correct orientation as on the device. This becomes obvious when images are uploaded from devices that use this data such as iPhones and display sideways or upside down. This results in images being rotated incorrectly when this data is present. WikiTree ignores EXIF orientation data when rendering images.

Exif pilot correct orientation