The changes I make in the Customiser for the font under Customising > Typography > Body
is being correctly applied throughout my site, including in my template for media attachments.
But there is one anomaly, which is the Line Height from the customiser, is not working for text inside an ACF Repeater type field in this template. The font size is changing in there but the line height stays bunched up.
I am using the Customiser defaults for Line height i.e. 1.5, as I understand this automatically maintains the ideal line spacing regardless of changes in the font size etc.