I don't know what the possibilities are on the open-general.com server
So I'll try to explain the idea
There are situations when you need to place/show a drawing on the forum
You use free servers then (I did that too)
If such a server stops working (free hosting is unprofitable) - we lose these files
If these were important things, from the community's point of view, e.g. a good tutorial, showing a solution to an important problem (and it was lost forever) --> then you should ask about placing these things on a good server (so that they don't get lost)
How is it solved on opengeneral.pl?
Darek, knowing about the problem of lost files --> shared a folder (for everyone from the forum), where you can place drawings (there are limitations regarding the size of the file, its editing...)
However, several people who create for OG - received personal folders with greater possibilities
This system has been working for several years - thanks to mutual trust
What do I use the personal folder for?
I place unpublished maps (for campaigns converted from PEG), alternative maps e.g. in gray colors, for showing errors, explaining/answering questions (supported by a drawing, screenshot)
Also to illustrate played campaigns
If I'm talking to you - I also place necessary/helpful drawings there
Things like Randowe made map backgrounds - I think they should be stored ... so that they don't disappear with the server not working
Thumbnails were generated from these map backgrounds (size 400x400px)
I don't have them (nobody has them)
I generated --> prefix min_"name"
Additionally, I generated for the latest DvWxlri background
They are in the same folder as all backgrounds
https://drive.google.com/drive/folders/ ... sp=sharing
Darek told me already how it is done in the polish server and he is probably working already to do something similar en open-general.com so can be sure that will be implemented here soon ... 
@Darek