Hi, @Camilla!
I apologize that it has taken a while to figure this out. We ended up discovering some other problems with q2studio that took some time to fix. The bug fixes should be approved this week once this pull request is merged: Fix importing by andrewsanchez · Pull Request #179 · qiime2/q2studio · GitHub.
A new VirtualBox image will be published with q2studio updates with the next release of :qiime2:, scheduled for 5/28. [Preview] QIIME 2 2020.6 development changelog.
In the mean time, you are welcome to install the updated version of q2studio from source at GitHub - qiime2/q2studio: Prototype graphical user interface for QIIME 2
Sorry for the inconvenience!
Best wishes,
Andrew