"Here is/are" followed by plural [closed]

Documents are plural, so the only correct usage is:

Here are the documents needed

This isn't an edge case, so it is simple. Compare

Here are the potatoes

and

Here is the sack of potatoes

Where the subject is plural, you use are and when it is singular you use is.

The fixed presentational phrase Here/There is/are ...,

Here is the coffee ~ There is the cream ~ Here are the saucers ~ There are the spoons.

as well as the existential phrase There is/are ...,

There is a unicorn in the garden ~ There are some people here to see you.

are prone to contraction, like all fixed phrases.

Here's the coffee ~ There's the cream. /hɪrz/ and /ðɛrz/

But contraction with are is difficult with here and there, because they already end with /r/,
so adding another /ər/ syllable afterwards makes it hard to hear the difference.

Here're the saucers ~ There're the spoons. /'hɪr(ə)r/ and /'ðɛr(ə)r/

Consequently they are uncommon as contractions in the language. However, it's extremely common to use the singular monosyllabic contraction (Here's, There's) even before a plural noun phrase.

This is because the subject does not precede the auxiliary, but rather the reverse. English number agreement works only forward, except for archaic and vertiginously pedantic constructions like Here am I or There is he.

Consequently the way these would be said in normal conversation is