You're not getting annoying over nothing. part of the composition is the frame shape.
Photography
A place to politely discuss the tools, technique and culture of photography.
This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.
If you know the photos are going to be used exclusively for ig, I would ensure they're all exported in a way that minimizes the cropping IG will do. Also you could just send all photos in portrait mode to this specific client to have a little more control over how they turn out. It's annoying but most people who aren't photogs don't realize this so I try to mitigate this by giving them fewer options after editing.
I wrote an action for situations like this with my work. It will detect portrait or landscape and place the image in a white square. Its not full size but the composition stays consistant.
There is also the possibility of using one of those apps for seamless scrolling.
The thing is, it might be annoying for you, but in reality the medium they want the pictures for is instagram and you failed to deliver for that medium… you wouldn’t hand over a couple of portrait pics for a billboard ad. They are doing the cropping work and you are annoyed because they are not doing a good job. But it’s actually your job.
And I know it sounds a bit harsh, but I’ve been there and this change of mindset is important. Ask what the medium is and deliver for that.
IG will cut your photos vertically so your original composition doesn't really matter, if you know she is going to do this why not cropped them yourself and give her options? at the end of the day she will do whatever she wants with the pictures at least this way you will have a say.
The Insta cropping is totally annoying. I can post anything I like on FB in any aspect ratio and it gets posted in the native format. You think the geniuses at Insta could implement the same feature. They say the cropping is for consistency but I call BS....
What would make sense to me is making two posts with the different orientations seperately if there’s photos you like from both.
this absolutely does not make any sense. if you use the platform for marketing you want to group the pictures by their content, not how they best suit the feelings of the photographer.
how do you push two different posts of the same thing? you lose reach and interaction, it doesn't make sense.
you need to learn that you're doing product photography here, not art. it's your job to make it work for your client, not the other way around. she's trying to sell her brand, not your photography.
what you should do is provide vertical shots only for her instagram. crop them to 4:5 for regular feed-posts and to 9:16 for stories and reels. that way you still have creative control and she can post them as she needs.
landscape is not suitable for instagram, especially when you're trying to sell something.