Substance "sbsar" file doesn't keep changes

I have been working with “sbsar” files from Substance Designer (SD) and i can’t get Unreal 4 to save the latest change to the substance file. If i export a new change from SD, i have to click reimport to bring in the new changes. The issue is when i have multiple “sbsar” files i have to keep remembering to click reimport and if i load the project back up it looses all the changes. Unreal doesn’t seem to store the latest change and results back to the last cached version. It is getting super frustrating trying to manage all the files and remember which ones i have already clicked reimport.

I don’t know if i am going about this the wrong way, but any help would be greatly appreciated!

Does anyone know anything about this problem or has any information on how they work with Substance Files as textures (with iterative changes to the file)?