Image filename format rules

The work flow I'm working with is as follows...

1. Photos taken on a digital camera producing image files in the format "Pfffnnnn.jpg" (as in my first post).
2. These are loaded onto the MacBook Pro using the built in SD card reader.
3. Filename is edited using Finder by adding "SSX-Placename-MI-1_" to the filename as a prefix. eg: "SSX-Placename-MI-1_P1230001"
4. At this point it would be ready to upload, but I can also transfer the file to the iMac by linking the two devices and drag & drop. This works and the iMac will accept the filename format.
5. To transfer the file to the iPad I copy it back onto the SD card and use the SD card reader plugged into the iPad. This is where the transfer fails. The iPad Photos app doesn't "see" the image. All other images on the SD card are however available for import.

The purpose of this convoluted method is that I then have a portable copy to take to site and refer to.

One approach I will try today is to email the image to myself and open it on the iPad. The problem with this approach is the number of images is likely to exceed 450. Too many emails!

I don't use iCloud for image storage or transfer.

I have now tried to email myself with the image (renamed) attached. Although I can view it within the email, if I try to save it the image does not get added to either the download area or to Photos. So this method fails.

I think I have solved this issue myself.

All the above happened as previously posted, what solved the problem appears to be the march of time!

I went back over what I had tried previously and found the sample image I was using happily sitting in the iPad Photos library! You can open the file and view it, edit it, etc - no problem. I don't know why, but it seems to have taken 24 hours for the iPad to accept the renamed file. As I am not using iCloud it can't be a poor connection to Apple.

So, Problem solved thanks for the interest...