4 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

I have a card with [Hybrid] or [Insectoid] in its traits in this Digimon's digivolution cards. Does this card’s <When Attacking> effect force me to digivolve this Digimon into a Digimon card with [Insectoid] or [Ten Warriors] in its traits in my hand?
No. The effect reads, “This Digimon can digivolve,” so you can choose not to.
Ruled Mar 28, 2024
When digivolving with this card's <When Attacking> effect, paying the digivolution cost moves the memory gauge to 1 or more on my opponent’s side. What happens to the attack?
The attack continues. The turn doesn’t switch over just yet. If the memory gauge is still at 1 or more on your opponent’s side after the attack ends and any effects triggered by it finish activating, only then does the turn switch over.
Ruled Mar 28, 2024
I attack with [EX1-035]/[Kabuterimon] and digivolve into this card with its <When Attacking> effect. Can I then digivolve again on the same attack with this card's <When Attacking> effect?
No, it is too late to trigger this card's <When Attacking> effect, since the Digimon didn't have it when the attack was declared.
Ruled Mar 28, 2024
When digivolving into a Digimon card in my hand with [Insectoid] or [Ten Warriors] in its traits with this card's <When Attacking> effect, can I ignore that card's digivolution requirements?
No, you can’t ignore its digivolution requirements.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.