No apology necessary. I think your explanation helped me to understand the issues you were having.
“ Data resides on an external hard disk”
I operate a PC with Windows 10 and use an external hard drive for my main data storage so perhaps I can help. Presumably our systems are similar.
“ RM8 does not access the media folder specified in ‘Folder Settings’ when …”
That seems like a path related problem, possibly stemming from work done before you moved data to drive G:.
“ The location of the media is G:\Family History Exhibits”
I’ll assume that “G” has been assigned to your external hard drive rather than having windows allocate that drive letter. Please ask if this comment causes any confusion.
“ Data used to reside on my C: drive”
That’s the windows default drive and could well be the root cause of your problem since any paths used in linking data would have been based on that drive letter during your earlier testing and stored within RM8 links to individual items. Those links will probably not be changed by any subsequent settings changes in RM8.
“ Many exhibits are correctly reported as broken links. I am manually relocating (and renaming) these files from C: to G: and redefining the location for each event attachment”
I would proceed as follows:
COPY the whole Media Directory structure from C: to G:. This will give you two identical copies of your media files one on each drive with the existing links in RM8 still linking to the C: drive media directory and the second copy on G: drive unlinked.
Next Rename the C:drive media set head-directory by prefixing its name with XXX. This should break all the links but will allow you to reverse the process if the need arises.
Don’t be alarmed by the mass of red crosses that will appear on the icons in the RM8 media folder.
Now in RM8 go Media > 3-dot Menu > Fix broken media links > A selected drive or folder > Enter the path to the head folder of your G:drive media set > Select Search for missing files. This will allow RM8 to establish corrected links to your relocated media files subject to no file renaming having been done in the meantime.
Hopefully all the red crosses should now disappear from the media icons in the media panel of RM8.
If any don’t these will have to be re-linked manually by editing their individual link paths on the MEDIA page of RM8.
Select an Icon with a red cross in the Multimedia panel > In the Edit Media panel Click in the “Filename” box > Select the file icon at the end of the box This opens the windows file manager > Navigate to your G:drive media storage and select the required file. Check in the Edit Media > Filename box that the path and filename is correct. When satisfied, repeat for next problem file until done.
Note that each link correction done here corrects for ALL uses of the associated media item and should avoid the need to edit each individual fact, etc, separately.
This probably helps to explain the behaviours that you described in the latter part of your post. I hope it helps but feel free to query anything that is still not clear.
And of course, once all the red crosses are dealt with, the original MEDIA data-set on drive C: can be deleted unless you need it there for some other purpose.