Coding works for WORD but not POWERPOINT, how should i modify it?

I would like to insert every 6 pictures in a new slide of powerpoint with it's file name at the centre bottom of the image itself.

The below coding works for word but not on powerpoint and i would like to do further editing.

1) modify coding so it'll work on powerpoint as well
2) current in word it's showing 1 image per page, can we modify to show 6 images per slide when it comes to powerpoint?
3) the file name in word currently showing the format of the file e.g. jpg / .png, how could i skip that?
4) the file name is showing on the bottom left in word, how can i make it centre bottom?

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