When you attempt to process Lockbox transactions in Web client, the user browses to the import file on a mapped drive and the file location is changed to C:\GPHTMLTMPE\1 and will not process. In fact, all configurator type files (Lockbox, Safepay, EFT, Payroll DD, Electronic reconcile) have an issue in Web client with the path. Please fix. The work-around is to use the Fat client.

Link to safepay product suggestion:       

 https://experience.dynamics.com/ideas/idea/?ideaid=289bdfa9-3fb9-e911-b083-0003ff68bc25