It's very stressfull to copy some contents on Slack to Notion because their html are not compatible.
So, when I copy the contents include Bulleted list or Numbered list, I have to fix them manually.

These are the sample outputs of copy from Slack and Notion. In short, we will save text as plain text not markdown on Slack.

Case 1 : normal lines

[Original]
Apple
Google
Microsoft

[on Slack]
'Apple\nGoogle\nMicrosoft'

[on Notion]
'Apple\n\nGoogle\n\nMicrosoft'

Case 2 : bulleted lines

[Original]
- Apple
- Google
  - Microsoft

[on Slack]
'Apple\nGoogle\nMicrosoft'

[on Notion]
'- Apple\n- Google\n    - Microsoft'

Case 3 : numbered lines

[Original]
1. Apple
2. Google
  a. Microsoft

[on Slack]
'Apple\nGoogle\nMicrosoft'

[on Notion]
'1. Apple\n1. Google\n    1. Microsoft'

Because Slack will return plain one, we cannot keep the structure of nested lines...

pip install sncopy

Basically, you only have to call sncopy on your terminal after copying your contents on Slack.
This command will automatically convert them to Notion's format.

If you want to convert to bulleted lines, please call sncopy command with --mode option.

sncopy --mode bullet

for numbered lines,

sncopy --mode numbered