You can connect your Simple Invoice account to your Dropbox, Google Drive, and FTP accounts and upload all your document types manually or automatically.
Please click on the link near the upload option you wish to use in order to get more information about connecting your account.
Dropbox: https://support.simplio.app/knowledgebase/how-can-i-upload-my-invoices-to-dropbox/
Google Drive: https://support.simplio.app/knowledgebase/how-can-i-upload-my-invoices-to-google-drive/
FTP: https://support.simplio.app/knowledgebase/how-can-i-upload-my-invoices-to-an-ftp-server/