Flipping/rotating the trouble vertical photos:
1) Go into “Photos” on your iPhone, select the photo
2) click “edit”
3) bottom right has a square which flips the photo. Flip (rotate) ONCE only, so now it looks wrong, but just Save it.
4) then AGAIN open “edit” and flip/rotate a few times to normal. Then save. Now you can upload.
Alternatively I upload all photos to Google photo, then download a few for BCP, it’s never an issue once uploaded to Google photos. Similar when you import, back up your photos on your computer into any other program.