Problem with ipyfilechooser extension – FileChooser button not displaying

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Okay, I solved it by doing the following in my Dockerfile:

# Install the extensions globally via conda
RUN conda install -c conda-forge jupyterlab ipywidgets plotly

# Build JupyterLab to activate the extensions
RUN jupyter lab build

These extensions were already installed in my environment, but building JupyterLab at the base layer solved the problem.

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