Let's show you how to rename multiple files on your iPad using Filebrowser's Bulk rename tools.
You can add text to the beginning or the end of all the files you selected. For example "Presentation_Filename.pdf" or "Filename_Presentation.pdf".
Find and replace words within your file names. For example you could bulk rename all ".jpeg" files to ".jpg" files or replace "_DCS" as the prefix for all your files and change it to "IMG_".
This method would preserve existing image numbers in the filename.
Add an Index, a Counter or a Date before or after your existing filenames by leaving the Custom Format box empty. For example:
If you use the Custom Format box, existing file names will be replaced with the text. For example if you want to rename all your photos that were previously something like this:
You can rename them all to be "Holiday_(date).JPG", replacing any names they previously had.