I've search and found several posts relating to this topic. None of the questions or answers seem to help. 

Windows 11 Pro Version    10.0.26100 Build 26100

inkscape-1.4.2_2025-05-13_f4327f4-x64

From the "Flow Text into Frame" tutorial:

Flowing Text into a Frame

Whether you’re creating a graphical poem (calligram), or whether your text needs a specific shape to fit into your layout, Inkscape offers you a tool to assist with this type of design.

To use it:

1. Write the text on the canvas (or copy-paste it).

2. Create the path or shape that the text is supposed to fill.

3. With the Selector tool, select the shape and the text, then use Text ‣ Flow into Frame.

I've attached a video of me doing the following:

1. add a flowchart symbol
2. select symbol and Unlink clone
3. Select text tool and add some text that will need to be "flowed" in order to fit the symbol. Make sure it has at least one space in the text
4. Hold down shift and select text then symbol
5. Click on Text/Flow Into Frame
6. Watch absolutely nothing happen unlike in all those tutorials/YouTube videos.
7. Post on the inscape forum.