When you reshare someone's post and add tags does it still not show up when someone searches those specific tags. I can't keep up with the way shit works

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When you reshare someone's post and add tags does it still not show up when someone searches those specific tags. I can't keep up with the way shit works
(or rather, the Page Who Added The Tag's page tag search. So like, if u click on the tag while on their page it will show everything they posted or shared that they added that tag to, buf if you use the global search function it will only show posts if the OP added that tag themselves)
Mew, no prob, it has confused a lot of peopl, hehe. Specially when u get to coner-case stuff like "What if I share my own post and add a tag to it, will it show up on global search?" (It, in fact, will)