Save as option before editing file? Insert page to existing file?

I have some files that are saved on one drive that I need to continuously change since they are a form that I fill in using an Apple Pencil however when I make the edits and notes on the form and save it only allows me to save it as the same file name with a one or two or three behind the file name. How can I save the file as a different name and then begin to make modifications so when I complete the edits and notations on the file I can save it back to my one drive without creating duplicate names? Under the options on a file I do not see save as or rename.

Also, how do you insert a blank page into a existing document?  This iPad application is new to me.