Don’t get mad at me. I did not invite a thousand people to our wedding. All I did was creating a link and sended it.

After "All I did was", the verb takes a bare infinitive form (no "to"), and both verbs must be parallel: "All I did was *create* a link and *send* it."

Why other options fail:

• Option 1 ("to create…sent"): mixes "to + infinitive" with past tense — not parallel.
• Option 3 ("created…sent"): past-tense verbs after "All I did was" are ungrammatical; "was" expects an infinitive form to follow.
• Option 4 ("creating…sending"): gerunds work in some dialects, but the parallel bare-infinitive form is the textbook answer.

Option 2: create a link and send it.