To edit files on iOS, fileshare is ideally integrated into the iOS file app; this can be done as soon as the fileshare app has been properly downloaded and installed from the app store. You can find the instructions here .
Now proceed as follows:
- Open the App
 -  Click the 3 dots in the sidebar and select Edit sidebar 
 - Now activate the slider for fileshare
 -  Finish with Done. 
 -  Now you can select fileshare from the storage locations and open files from here 
