Is there a way to change the Digitised Date for Mov files in Lightroom?

Question

I am scanning some old photos.  Unfortunately Programs such as Dropbox and OneDrive display Mov files by their digitised Date.
Consequently, My scanned photos are shown by the date that I scanned them. I can not seem to find anyway in LightRoom to change the Digitised Date so that they are shown on OneDrive/Dropbox in the correct order on my iPad.
Any help would be appreciated.

Answer 1

Your subject line says "Mov files" (which are video files), but your message talks about scanning old photos.  I'll address the old photos issue.
Because there are so many dates/times associated with photos, and because every program feels free to use its own names, it's critical to be pedantically precise about terminology. The date/time a photo was originally taken (when the shutter was pressed) is called Date/Time Original or Capture Date. The date/time a photo was transferred to digital media is called Date/Time Digitized (when the analog file was scanned or when the digital-camera shutter was pressed). 
A good rule of hygiene is to ensure every photo has a Date/Time Original (capture date).  Typically only digital archivists care about maintaining Date/Time Digitized.  If you ensure that every photo has a Date/Time Original, then pretty much any modern app and Web site will order your photos correctly.
In LR, you set Date/Time Original using the Metadata > Edit Capture Time command.  By default, LR won't write the capture time back to the file's metadata, so depending on how you are transferring photos to other programs, the capture time won't necessarily get transferred.  So you either need to do Metadata > Save Metadata To File, or better, set the option Catalog Settings > Metadata > Automatically Write Changes Into XMP.
Unfortunately, LR's Edit Capture Time isn't very flexible with dealing with scanned photos in which the precise date/time is not known.  So some people like to set an entire batch to, say, 1963/10/01 00:00:00, while others like to have each photo set in increasing increments of 1 second, so that programs will at least maintain the known relative ordering (which comes from the film or slide ordering).   To do that, you'll need a third-party plugin, e.g. ExifMeta or CaptureTime To EXIF.