Is there anything in RAW that says a spell effect must be within range to sustain it? For example, if I cast False Vision... do I need to stay within touch range of the original effect to Sustain it? Or a Light spell... say I cast it on an ally's shield and the party splits. Can I extend the duration as part of my next daily preparations if that ally is no longer in range?
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Not to my knowledge. Nothing in the Sustain a Spell action says you have to be within any kind of reach/range.
Unles a spell says it's effect ends when you're out of range, it doesn't end. Shouldn't matter if that spell has a fixed duration or you need to sustain it.