Most likely MindNode Next is part of a workflow for you, rather than a one-stop destination. Therefore MindNode Next can import and export several file formats:

Import + Export

• Plain Text
• Markdown (with or without images)
• MindNode Classic (Single File Documents, adjustable to MindNode version)

Export only

• PDF (Mind Map or Outline)
• SVG
• Image (with or without background)

Be aware that some features, like MindNode Next’s connections, may be lost when moving mind maps between different applications.

iOS:

To import a document in a compatible format, navigate to it in your Files App. Long press the document and select Share. There, select MindNode Next to import to.

To export a document, tap the downfacing arrow next to the mindmap name. Select Export and choose the file format you want to export as well as the app you want to send it to.

macOS:

To import a document in a compatible format, find the document in your Finder. Right-click the file and select Open With and MindNode Next.

To export a document, select the Share button in the upper right corner of your mindmap. The following panel lets you save your new file as usual by clicking Export.

You can also share the exported file directly to Mail, iMessage, or AirDrop by clicking the Share button in the bottom left.