I understand. For delivering images, all you need is read access to the share as a whole and write access to the temp and log folders.
If you want to upload images as well with the same credential, I suggest having a specific uploads folder where this credential has write access (rather than giving read/write access to the entire images folder).
As an aside, I tend to create 'locked' and 'unlocked' automation flavours for 'risky' environments. This ensures that for certain types of imaging tasks you can be assured that the keyboard and mouse are locked out.