Add an import / export dialogue
It seems that, when I export a database the "mass calculations" fields are not exported. Am I right?
Also, I would really love to have the option to export filters with the database, An export / import dialogue could be helpful to select which features of the DB shall be exported or imported.

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Amund commented
For export you can use ordinary filter and then the function for send/share (not export). Then just the records that is filtered is exported. Wich fields that should be exported can be edited by the library settings -> "format email contents"
(I don't have a phone with english language - so maybe a little bit other names).
For import though I completely agree!
What fields isn't so important - this I think it's ok to manipulate in advance. But it should be a dialog to select what field that is a unique identifier. And then possibilities to select what records to import: New, existing or all.