Only add a page number to a file or directory name if there are more than one pages, slides, media and so on in one post

[arisboch]

Is there a way to only add a page number to a file or directory name if the page number is either existent (not "none" or similar) or more than one?

[mikf]

Not at the moment. At least not in general.

[TestPolygon]

+1.

Also I want to specify an optional prefix/posfix, that will be added only if there is a page number.
For example, in PixivToolkit I can use such pattern {id}#_{pageNum}p#.
For 1 image I get: 11223344.png, for multiple: 11223345_0p.png, 11223345_1p.png.

[mikf]

As long as there is a count metadata field or similar, you can use conditional filenames (4cf4043).

For example

"filename": {
    "count > 1": "{id}_{num}.{extension}",
    ""         : "{id}.{extension}",
}