Running Multiple Macros on Different Cell Changes

Thanks in advance for your patience with me as I'm new to these forums, and pretty new to Macros/VBA in Excel.

I have a workbook with multiple sheets that all feed data into two main sheets, called 'Timeline' and 'Dashboard'

I have a macro to run an AutoResize function on 'Dashboard' rows:

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And then I have the page code of each data source sheet execute the AutoResize macro when any of three different cells are modified on the sheets. From the page code:

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So my question is this: I have the following NEW macro called AutoFilter, created to run an auto filter to hide any rows where values of "#N/A" are present from the 'Timeline' sheet:

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When I run it manually, it filters out rows with "#N/A" just fine. So I want to then make an addition to the page code above to execute AutoFilter if a range of cells are changed. I tried the following (copied the WHOLE sheet code) but it doesn't work when I modify the cell in the column identified:

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With this, the first portion still works (I modified one of the cells, and it executed the AutoResize macro just fine) - but if I enter data into the column that should trigger the AutoFilter macro, it doesn't fire off. I go to the 'Timeline' sheet, and see the new row isn't visible. But when I open up the Macros and run AutoFilter manually, it pops up just fine.

I have tried just using Case "$C$18" in case ranges were not possible with this code, but that didn't help. I also tried doing just the Worksheet_Change1 code in a blank sheet using A1 as the reference trigger for firing off the AutoFilter macro, but that did not work either.

So that's my issue - what am I missing to make my life a whole lot easier on this end? Thanks in advance for any help.

Something like this:?

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