The applications supports images (JPG, PNG, etc.) and PDF-files as attachments for new expenses . You're required to supply some details to complete the expense form, such as description, amount and expense date. Depending on your company settings, field may or may not be available and/or required (such as VAT input, category, project and/or payment method).
As mentioned earlier all expenses need to be combined using an expense report. This is why you're able to choose a report directly from within the expense edit form. If there's no open report available, you may add a new one.
Once you've completed the expense edit form, press "Save". The expense will now show up on top of the main view. If you've placed the expense in a report directly from within the expense edit form, it will show up in the chosen report.