The "Insert and overwrite sequences as nests or individual clips" button in the Timeline panel dictates how a source sequence is added to a destination sequence. When this feature is turned off (deselected), Premiere Pro does not create a single, nested clip. Instead, it places all the individual clips, transitions, and graphics from the source sequence directly onto the tracks of the new sequence. This action effectively "unpacks" the source sequence into its constituent components within the destination timeline.

A. Creating a multicamera source sequence is a separate, deliberate workflow and is not the result of dragging a sequence with nesting disabled.

B. You can always edit a sequence into another; this toggle only changes how the clips are inserted (as a nest or as individual clips).

C. This describes the behavior when sequence nesting is turned on, which is the opposite of the condition stated in the question.

1. Adobe Premiere Pro User Guide. In the section "Nest sequences in Premiere Pro

" the documentation explicitly states: "To toggle nesting on or off for sequences

click the Insert and overwrite sequences as nests or individual clips button in the Timeline panel. When the button is on

sequences are nested. When the button is off

the individual clips in the sequence are added to the Timeline." (Adobe. "Nest sequences in Premiere Pro." Adobe Help Center. Accessed 2023. Section: "Nest sequences").

2. University of California

Berkeley - Graduate School of Journalism. In their "Premiere Pro CC 2019" training documentation

the concept is explained: "By default

when you drag a sequence from the Project panel into the Timeline

it becomes a 'nested' sequence... You can turn this feature off by deselecting the 'Insert and overwrite sequences as nests or individual clips' button... With this button deselected

dragging a sequence into the Timeline will add the individual clips from that sequence." (UC Berkeley Graduate School of Journalism. "Advanced Editing in Premiere Pro." Advanced Media Institute. Page 12

Section: "Nesting Sequences").