Uploading a receipt, from + Receipt, the quick form or an expense's page, failed with "The expense could not be saved. Try again." because the server had nowhere it could write receipt files. Receipts are now kept in storage that the server can write to and that is kept from one update of Magpie to the next.
Expense receipts save again
Uploading a receipt to Expenses failed with "The expense could not be saved." Receipts now save.