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Every time I try to save the project or import new files Animate stops and takes a long while to come back, sometimes it crashes completely
assign a custom keyboard shortcut (edit > keyboard shortcuts), if don't already have, at least, one assigned.
then reset your preferences, https://helpx.adobe.com/animate/using/set-preferences.html
then check that your custom keyboard shortcut(s) were re-assigned to defaut(s).
that usualy fixes serious quirky problems.