The best thing for a collection of large photos is to put them on a picture hosting site that allows direct links and then use the
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code to link them into the post if you want to discuss a particular one. If you just link the folder, it may be harder to reference things.
However, I like to note that there's a difference between cropping and compression. You can try to make the image very small in pixel dimension. That will reduce the file size. However, simply selecting a compression to "medium" quality (or 65%) will greatly reduce the file size without making the image smaller. The compression will loose some fidelity but unless you are trying to make a photo book or enlarge the image a lot you would probably not even notice.
That said, cameras have many more pixels than can be displayed on a typical screen. And the forum does not have the ability to scale images on the fly like more modern social media software. I found that scaling or cropping images to where the longest edge is 1200 pixels leave you with something that has a lot of detail, and if compressed to medium quality will have files of a nice size that doesn't chew up our storage limits, but allows others to see enough detail.
I only edit the forum on my desktop (Windows) and there's a nice app "Resize my Photos" that gives me full control. Alternatively, I found that emailing photos from the File Explorer will perform the same reduction. It's an extra step to save the processed files back to a file folder so they can be used as attachments in the forum, but it's a way around when you don't have an app.
Of course, if you have photo editing software, even the (almost free) versions like Affinity Photo have ways to "export" Photos that support setting pixel size and compression ratios. I've used that method for many images I shared here, because it also allows me to crop out unwanted parts of the image in the same process.