Thanks for the answer =)!
I'm in fact using the Micasense Rededge camera. Photoscan version: 1.3.2.
Everything you said should work fine, but let me rephrase my problem.
Once I export the GeoTiff with the default options, the output is a single file with the 5 bands in it (so far so good). If I use visualize it using QGIS or a similar software I can see the 5 bands, but I don't know if "Band 1" is blue, green, red, rededge or NIR (I had to manually find the RGB order to get the correct visualization colors). Photoscan also uses the B1 to B5 notation, so what I want to do is figure out which band is which color.
Since I used a custom script to transform the raw camera images to reflectance images (and some exif data lost in the way), I had to use the folder structure to create the multispectral cameras in Photoscan (Worflow menu -> Add folder -> I select a folder containing 5 folders named "blue", "green", "red", "rededge", "nir"). The result is correctly created cameras, but can't find the correspondence between original folder name and band number assigned in Photoscan.