The singer explained how their home burning down in California wildfires contributed to the end of their marriage.
The singer and the actor separated after less than a year of marriage.
The Midnight Sky singer was previously forced to deny rumours the split was due to her having been unfaithful.
The pair cited irreconcilable differences as the reason for their split.
The Thor actor shared a video message on Twitter urging his fans to donate "whatever you can muster up".
She split from husband Liam Hemsworth earlier this month.
Miley Cyrus Slams Rumours She Cheated On Husband Liam Hemsworth As Madonna Insists She Has ‘No Need To Apologise’
The singer and Aussie actor announced they had split earlier this month.
The company behind the Australian actor's new film Killerman said: "Any story saying Liam cancelled press is inaccurate."
“I feel the need to set the story straight," the reality star wrote in an emotional post about his ex.
"Move on, we're not 17, I'm not who I used to be," Miley is heard singing on the heartbreaking tune.