Where to install plugins created with Qt 6.5 in Debian ?

[giorgik]

I installed Qt 6.5 in Debian and created a custom widget (plugin) with Qt Creator. Where should I copy the compiled .so file so that Qt Designer can see it among the widgets ?

[d_stranz]

https://doc.qt.io/qtcreator/adding-plugins.html

It is considered rude to post the same question to multiple forums.

Capture.PNG

[giorgik]

https://doc.qt.io/qtcreator/adding-plugins.html

I've seen this document before, but it's inaccurate as it doesn't exist in /opt/Qt/6.5.0/gcc_64/bin/plugins/designer. Instead, it exists in /opt/Qt/6.5.0/gcc_64/plugins/designer/
I put my .so plugin in the folder but in Qt Designer going from the menu: Tools > Form Editor... > About Qt Designer Plugins the copied plugin is not displayed, even by refreshing.

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Added after 1 14 minutes:

It is considered rude to post the same question to multiple forums.

I apologize

[d_stranz]

Have you searched from "/" to see if there are any other Qt directories? Or alternatively, have you executed "which designer" to find the executable's location?

[giorgik]

I'm giving up, I've tried them all, I've also tried again on Windows 10 and nothing has been resolved. I'm bored with Qt, they don't know how to set up a precise environment, with the right versions for its tools.

[Lesiok]

QtCreator uses its own Qt and QtDesigner package. Place your files in the <Qt parent directory>/QtCreator/lib/Qt/plugins/designer directory.

[giorgik]

QtCreator uses its own Qt and QtDesigner package. Place your files in the <Qt parent directory>/QtCreator/lib/Qt/plugins/designer directory.

In my Debian 11 distribution qtcreator (Qt 5.15.2) is installed in several places:
/usr/bin/qtcreator

qmake:
/usr/lib/x86_64-linux-gnu/qt5/bin/qmake

designer:
/usr/lib/qt5/bin/

So where should I put the plugin in question ?

[Lesiok]

I basically work under Windows but show the structure of the /usr/bin/qtcreator directory.
P.S.
In Qt Creator choose from menu : Help -> System Information.
In section Library Info You can see where is located Qt used by Qt Creator.

[giorgik]

Thanks for the advice, I'll try to see from the menu. I did as you told me. I am attaching the document in question
cartelle_Qt.txt
so where ? I found: /usr/lib/x86_64-linux-gnu/qt5/plugins/designer/
I put my plugin in the correct folder that I listed here, and here's what I see:
Istantanea_mio_plugin.jpg

Failed to extract plugin metadata...

Failed to extract plugin metadata...

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What did I do wrong in creating the plugin ?