Clipping Path in PNG File?

What is happening is exactly what’s expected. Each file format like PNG and JPEG handles its own specific list of features, no more and no less, regardless of what software you use to make them.

What clients want is a subject with the background cut out. There is more than one way to hide the background. You can apply a mask, which turns into a transparent alpha channel when you save. Or you can draw a clipping path around the subject.

The JPEG file format can store a clipping path, but cannot store a transparency mask (an alpha channel).

The PNG file format is the opposite: It can store a transparency mask as an alpha channel, but it doesn’t provide any way to store a clipping path.

This is not a problem in Photoshop, because whichever way you cut out the background, you can convert it to an alpha channel or a clipping path before exporting the file to the file format the client asked for.

For example, if I’m cutting out a background for your client and I used the Pen tool to create a clipping path, and the client is asking for PNG, then I know that when I’m done drawing the cut-out path, I must choose Layer > Vector Mask > Current Path to convert the path into a transparency mask, which PNG is able to store as an alpha channel. Then, when exporting as PNG, I must make sure that transparency is enabled in the Export settings.

Again, this is because of the capabilities of file formats, not anything to do with Photoshop, so all of this would still be true even if you were using a different photo editor by another company.