I've used QGIS for many years and made great flow maps.
But within QGIS 3 I can't find any flow making plugin like the ones in QGIS 2.X versions.
Do you know how to do?
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All QGIS plugins will have bug report and issue tracking pages.
I would post an issue on the specific plugins issue tracker to see if they are converting it to QGIS 3.
If not you could try converting it yourself. It is not a difficult process.