Object seems to be locked, but isn't

my object seems locked, can't edit it, isn't locked on layers panel. whenever hit edit original, brings me pdf file in preview. there's not clipping mask needs released either, i'm confused why happening! advice appreciated. screenshot of illustrator shown below.

it says linked in layers panel, reason.

how did object on artboard?

if got cc library, hold down alt key when dragging library.

if placed it, don't check link option during placing.

in both cases can go links panel , embed object.

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