Cubase - Change back sample rate of imported and converted audio.


New Member
I got loads of audio clips that have been converted when imported into a Cubase project from between 96khz and 48khz down to 44Khz (as that was the rate my projects). I need to export the project in 48khz and not sure if changing the sample rate of the project will just upsample the downsampled audio with blank empty bits or if it switches it back to its original higher sample rate of the audio clips?
I basically want to make sure that I use true 48khz and not upsampled from lower rates.

How should one go about changing this?
Reimport the audio somehow?

Any help is greatly appreciated!