Advanced search: Last x hours? Attached xor linked files?

I searched without success a way to do the following:

1) Create and save an advanced search for any item added the last hour. (Found for the last day.)
2) Create and save an advanced search for any item with a file (e.g., .pdf) linked to it (but not attached).
3) Same as 2) but for attached files only.
I managed to search for a given extension (pdf). However, it returns both linked and attached files...

Are there any way to do this currently?

Thanks a lot!
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