LA CROSSE, Wis. (WLAX/WEUX) – An inmate at the La Crosse County Jail is accused of uploading child porn to a web-based app. 40-year-old Matthew Copus is charged with four counts of possession of child porn.

Authorities say they got a tip from the National Center for Missing and Exploited Children. It led them to digital files uploaded to A Drop-Box account. A search warrant was issued when the account was linked to Copus, who was in jail at the time the tip was received.

His phone was seized during booking, and authorities found more child porn after it was searched.