File Size
The filesize sensor is for displaying the size in MB of a file.
File paths must also be added to allowlist_external_dirs in your configuration.yaml.
Configuration
Adding File Size to your Home Assistant instance can be done via the user interface, by using this My button:
If the above My button doesn’t work, you can also perform the following steps manually:
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Browse to your Home Assistant instance.
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In the sidebar click on Settings.
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From the configuration menu select: Devices & Services.
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In the bottom right, click on the Add Integration button.
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From the list, search and select “File Size”.
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Follow the instruction on screen to complete the set up.