Uploading any type of file from iPad/iPhone (iOS)

I am trying to figue out how to upload any file type from my iPad to the WD My Cloud. I know how to upload pictures but anything else I can’t do.

I can upload anything from my android phone. Purchased Movies, .PDF’s, Music.

Is there a way to do the same from an iPad/iPhone?

In the app that owns the file, do an Open With or Open In action and select the My Cloud app. From there, copy it to your Cloud.

I find that not all app’s have an Open in or with feature. I’m trying to use a file explorer, tried iFile but it’s not working.