What fact are you using to record this event? You have to use a Fact to get an event into the timeline.
I have an event that I call Real Estate for real estate transactions (separate and apart from the Residence fact). Any sale or purchase that I record in that Fact shows in the timeline.
It helps to put a description of what is going on in the description of the fact. For example, there were a series of events documented in my great-grrandfather's Homestead packet. I entered each step of him getting his Homestead that happened over an 8 year period as separate Real Estate facts, with an appropriate description, like "
03/11/1871, Homestead Act Application No 829: SW1/4 of NE1/4, W1/2 of SE1/4, NE1/4 of SE1/4, all in Sec 33, Twp 5 So, Range 4W
03/05/1878, Application to Perfect Homestead Claim 829
12/06/1879, Cloud Co Register of Deeds Records the Patent in County Record book J, pg 185
These events all show in my timeline for this ancestor.