Every time the Print Screen key is being pressed in MSTS a.pcx image file is created in the folder where the Train.exe resides. They are consecutively named scrgrb0.pcx, scrgrb1.pcx, scrgrb2.pcx and so on. Every time another MSTS session is being started and more shots are taken, these files will again be created starting with scrgrb0.pcx and therefore overwrite existing ones.
Here I am dealing with one taken in my German WUPPER-EXPRESS MINI route, using the FREE and excellent IRFANVIEWERfrom www.irfanview.com . There is a comprehensive tutorial for it here:
##-WIP is my "Work in Progress" folder I have pasted the *.pcx files into for processing, making sure that they are not wiped out by another MSTS session!
Having uploaded the Jpeg, Gif or Zip into the message's Attachments box, I prefer to COPY / PASTE this line into the message text where I want the attachment shown, deleting the file name from the Attachments box as soon as that is done!
This will avoid what you can see below, Attachment links not in places where they ought to be and when clicked on create a new window, one has to take care not to "Close" using the Back Arrow instead!
Also remember that FIREWALLS need to be shut down before attempting to Upload, not liked by the Uploader!