I'm having trouble with texture replacements. Please send help. (I use photoshop)

[sicknesseater]

I'm actually not that new to modding, especially when it comes editing .dds files in photoshop and switching out textures. Due to unforeseen circumstances I recently had to buy a new computer. Now I can't seem to edit a simple texture to save my life. I am using the NVIDIA .dds plug in and the most recent version of photoshop. Whenever I open a .dds file it's layer label appears as "decompressed image" instead of "background". When I edit and save it appears to have saved correctly but for some reason only the old texture will show up in the game even though i edited an item's associated .dds file.I am beyond confused right now.