Dakota Mortensen‘s been showing friends videos of the alleged incident involving ‘Secret Lives of Mormon Wives’ star Taylor Frankie Paul, and the footage is raising serious concerns among the group … TMZ has learned.

Sources with direct knowledge tell us the alleged abuse between Taylor and Dakota was captured on camera … and there are multiple videos spanning over a significant period of time.

We’re told the clips allegedly show a series of heated moments between Taylor and Dakota — some of which have been shared privately among their inner circle — and include shots of Taylor hitting, punching, biting and grabbing at Dakota.

People close to the situation tell us the footage has sparked worry about the toxicity between these two — who have to co-parent their son, Ever.

We’re told authorities have seen the footage, but it is unclear whether or not it’s being included as evidence in the latest investigation.