Local Hosting: changing companies, migration, app

Hello, I have installed akaunting locally. But now I have 3 questions:

1) I created a second company for my private accounting, but when I'm changing the companies there is shown only a blue screen (like the screen with the log-in-window - only without that window). How can I switch between the both companies?

2) Before I used the hosted version of akaunting. Is it possible to migrate the data from the cloud to the local installation?

3) Is there also a possibility to use the local installation with the app for adroid and windows 10?

Thank you very much for your answers.
Regards Ivonne

1) i had that once, check the .env file in root folder for APP_URL= path is set to https://****yoursite**** if you use https, mine was http and it made cross-site error.

2) the devs dont answer much here it seems, and i see no backup possibility for export/import and i cant see any apps that does it.

3) i dont understand that question?

Also a little hint, make sure your .env file isnt downloadable on your server, some places you can download it :).