Do I really need to save two files for one scan?

Hi,

I am enjoying the new features in the latest Scan update on my up-to-date, 7th gen iPad, except for one thing.  Let me explain:

I saved one Scan, numbering two pages.  Everything worked out great.

After this, I save the scan, now a .pdf, to my Dropbox account.  I want to save the scan to both my PC and in Adobe Reader on my iPad.  I tap on Save a Copy and choose Save to Dropbox.

My next step is to rename the file.

The dialog box that pops up asks if I want to rename TWO files.  I made only one.  ???

Confused I agree to renaming two files, but don't know why.  One is a .pdf, the other is a .txt.  ???

Files(s) renamed, one ends with ,pdf-1 Nd the other with .pdf-2.  ???

     Can my PC even OPEN a file ending with .pdf-1?

This two-for-one thing is new.  When the first round of AdobeScan improvements showed up, I was able to rename just one file.

Is there a setting I need to turn off somewhere?  Or is this a bug that I am now reporting?  Anyway, I'm very confused.