Fund shows a distribution I never received and my units didn't change Mechanics

You almost certainly hold the accumulating share class. Accumulating funds reinvest income inside the fund rather than paying it out, so the value shows up in the unit price and neither your cash nor your unit count changes. The distribution figure on the statement is there because in many countries you're still taxed on that income even though you never touched it.

That last part is the bit that catches people. Look up whether your jurisdiction treats accumulated income as taxable — if it does, you need the fund's reported income figures at tax time, and you also need to track it so you don't pay tax twice on the same money when you eventually sell.

If it's inside a tax-sheltered account, none of the tax tracking matters and you can ignore all of this. Worth checking which account it's in before you build a spreadsheet.

Quick way to confirm: check the fund's name or ISIN. Accumulating classes usually have Acc, C, or similar in the name; distributing ones have Inc or Dist. Same underlying fund, two wrappers.

For what it's worth, accumulating is usually the easier choice for someone in the accumulation phase — no cash sitting around uninvested, no manual reinvestment, no dealing fees. The tax admin is the price you pay for that.