To enter your expenses, go to the Track view and locate the 'Expenses' button at the top:

Adding an expense will create an expense log. You can view the expense logs in the Track view or the Detailed view.

You can attach receipts or other files to support the entered expense. Allowed file extensions are: .pdf, .csv, .xls, .xlsx, .doc, .docx, .txt, .jpg, .jpeg, .png, .gif.
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To mark the expense as billable, it needs to be assigned to a billable project. On non-billable projects, you can't enter billable expenses. However, you can mark the expense as non-billable on billable projects by unticking the 'Billable expense' option.

Billable expenses are included in the billable amount, while non-billable expenses are included in costs.

Additionally, you can create tags (for example: 'Materials') and mark expense logs with the tags to be able to filter them out in the Detailed view.

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Go to the Detailed report to view logged expenses and attached receipts. Use the 'Edit columns' button to add relevant columns to your view:

Once you add the 'Log type' column, a related 'Log type' filter will appear in your view:
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Using this filter, you can set the view to display only expense logs or only time logs.
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To be able to view and download the attached receipts, you need to set the level of detail to Expanded:
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Then the attachments will be displayed here:

Billable expenses will be automatically included in the total billable amount for the invoice. Unfortunately, at this time, it is not possible to invoice expenses separately from the billable time, but this feature is already in development.