There are 2 ways in which you can create an expense on Slack:
Upload receipts directly
Open the Fyle app's message section and upload a receipt.
Soon an expense will be created. You can edit this expense in Slack or view it in the app.
Add expense details first
Type /expense-form in any chat box in Fyle.
An expense form will open on the screen. Fill in all the details and click on 'Add Expense'.
An expense is created. If you wish, you can now add a receipt to this expense. Simply add a receipt in reply to the same thread and Fyle will attach it to the expense for you!
P.S.: If you want to edit your expense from Slack, click on the 3 dots option to do so.
To know how to link your Fyle account to Slack, read here.