The sample he sent earlier works fine. I created a panorama with it and then put it into a WP post.
A lot of things, but it may depend on how you are putting the picture into WP. When I dropped it directly into the Scene line in iPanorama the file name was same as original. When I created s 2nd scene using the same image, but from the library I got the “-1”.
/wordpress/wp-content/uploads/2024/10/cubemap.jpg
/wordpress/wp-content/uploads/2024/10/cubemap-1.jpg
I actually now have two copies of the same image one with normal file name, and one with the -1 so it sees them as different images. Note that BOTH of them work. So it may not be the -1 in the name.
Which “image” type are you selecting from the iPanorama drop down? I used the “Cube 1 Texture” option. The “6” does not, even though there are six in the image.
Maybe try saving the image in the thread earlier, then dropping it directly into the scene line, not selecting it from the library. I do not know if you have to remove any of the prior images from the library first. Click on it to open it, then right click on it to save the image.
Not the issue here, but you might want to know that WP converts images so they works in responsive themes, different sizes for different platforms. I found early on that while my pictures looked very sharp when viewed outside of WP when I put them into iPanorama they were blurry. (NOT iPanoramas fault.) In some cases removing the -1 reverted to the original pixel count and a good image if they were in the WP Library, but directly loading them works every time. This does come at the expense of larger file sizes = longer load times though.
https://www.kasdorf.name/wordpress/2024/10/17/ipanorama-cube-image-format-test/