How to export/import SQLite and the corresponding assets

Hi, thank you all for this great app.

I am trying logseq DB.
Exporting to sqlite and assets works partially. It generate a zip but the png in assets can not be open. Copying the graph manully works.

Moreover, I do not successfully import them (at least via option)
Import a graph, open a local directory, or add new graph will consider them as a MD version.
I guess that because logseq creates some folders I have seen from MD version.
However, it is sqlite, so I only got empty pages.

Only one thing can show content correctly.
Put the folder into the default location (C:\Users\\logseq\graphs in Windows for example), which also how I copy the graph.
It will looks like
C:\Users\<username>\logseq\graphs\<graph_name>\db.sqliteand C:\Users\<username>\logseq\graphs\<graph_name>\assets\
Then, reopen the application and get the graph.

Is there any proper way to export and import sqlite and assets?