https://community.bistudio.com/wiki/Arma_3:_Loading_Screens
Download PBO Manager on your PC
Install PBO Manager
Download current server mission to your PC
Use PBO Manager to unpack the mission
Make sure the image is in the PAA format - if it is not, use this image convertor online (https://forums.bohemia.net/forums/topic/230391-online-paa-converter-by-gruppe-adler/) to change the format to PAA
Make sure that there are no spaces in the image name
Open the unpacked mission folder
Navigate to media\images\loadScreens - transfer the image here
open the description.ext in the unpacked mission folder
find the line loadScreen =
After the equals, put the following → "media\images\loadScreens\IMAGE_NAME_HERE.PAA";
Save the file.
Use PBO Manager to repack the unpacked mission folder into a .PBO file
Upload the repacked .PBO file to your server's mpmissions directory.
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