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I’ve moved your post to it’s own thread, where it will get more attention.
Which software is installed on your iPad? This information is necessary, because it works different on iOS 10 or 11.
To find the iOS installed, open the Settings app, go to General - About, and look at Version.
Where do you wish to edit the file? Is it already downloaded to the app?
If word is installed on your device you can export the attachment directly to be opened in word. It will first open as read only file. The word will ask you to save it before editing. At this stage you can choose location of the file, where it will be saved. You can save it on any drive location, if you wish to open it on other devices with or without iOS. Or you can choose to save it on iPad. At the time of saving you will have an option of renaming the document file, which you can avail later also if you want.
If word is installed on your device you can export the attachment directly to be opened in word. It will first open as read only file. The word will ask you to save it before editing. At this stage you can choose location of the file, where it will be saved. You can save it on any drive location, if you wish to open it on other devices with or without iOS. Or you can choose to save it on iPad. At the time of saving you will have an option of renaming the document file, which you can avail later also if you want.
Open and edit a Word file - which I have downloaded from a web page!I can open email attachments, what I am trying to do is open to edit a Word file on a web page.
Oh ...for Safari users it is very common and usual, and my first response based on it only. Safari is recommended on iOS for these reasons only.I have solved it - thank you Google. This is probably something that you all know, but not for me the noob: simply use Safari (and not Chrome as I was doing), download the Word file, and the share link will bring up Word as one of the sendto options.