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Attached ZIP file holding "All-white.jpg", 10800 × 7200.

This is to verify that uploading a ZIPped JPEG with large dimensions works.
The ZIP file is under 4KB; the unzipped JPEG is ~1.2MB.

Untested: There may be a limit to the size of ZIP files.

The image was produced by starting with a not-all-white image, then adjusting Contrast and other settings until an all-white image resulted. That was then saved as a new file.
Surely an all white pic like this is going to have little image data, so zipping to under 2MB is not an issue.
Other medium-large pics with heavy graphical content will still have the issue.

Looking at the admin control panel on my other Xenforo site, there appears to be just one global setting for attachment size, regardless of file type. On that site, we are using the default size of 16,384 KB. As I said, no idea of how this is configured at MacRumors. But unless there's another setting I've missed (which is quite possible!) then you wouldn't be able to get around the attachment size limit by using .zip instead of .jpg or .png files.
So why not just raise the limit to a more reasonable 16MB then? 🤷‍♂️
Problem mostly solved.
 
I am also running into this issue if I had photos taken with the Ultra Wide camera of my iPhone, it gives me the image too big error. I have a 15 pro too. Probs due to file size?
 
It is more an issue of image size (dimension) than file size. The image cannot be larger than 2000 pixels in either direction.
That’s the reality. If I want to upload an image, I have to use an image downsizer, right? When I use the fusion cameras, telephoto, or main camera of my 15 Pro, I don’t encounter this issue because fewer pixels are used. It’s not about the size of the image, but the number of pixels. This particular image exceeds double the maximum resolution. Sample metadata below 👇
1740155460054.png
 
Unless there's been some change recently, these are the limitations. If you look at the previous page of this thread, there are several suggestions for reducing image dimensions to make them compliant.

The limit is set to 2000 pixels in either dimension. With over a million attachments in our database, you can imagine they take up a good amount of storage space.
 
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