I've done it recently (September 2024) and I uploaded as follows for my wife's application:
Financial Evidence
- Wife's Thai bank account statement
Other
- Wife's covering letter
- Wife & Son's Thai passports
- Letter from son's Thai school (and translation)
- Wife's & son's Thai ID cards (and translation)
- Son's UK Passport
- Copies of House Registration entries for Wife's family (and translation)
Life Events
- Wife's & Son's Birth Certificates (and translation)
- Marriage Certificate (and translation)
- 2x Wife's Name Change (and translation)
Sponsors /Employment
- Invitation Letter from me
- My passport (full colour copy)
- My bank and mortgage statements
- Details of my UK business (Company Registration docs, bank account)
- Log of money transfers to wife and my Thai bank account
By the way, I am resident in UK, wife & son are resident in Thailand, only travelled outside to Hong Kong once. She doesn't work and both are supported by me. 6 month Visit visa granted.