"A FY2019 appropriations measure significantly changes campaign finance reporting requirements for Senate candidates. Report contents will not change, but the method of filing will. The provision appears in H.R. 5895, a minibus package that includes three FY2019 appropriations bills: Energy and Water Development, the Legislative Branch, and Military Construction and Veterans Affairs. The Senate and House adopted the conference report accompanying the bill on September 12 and 13, respectively. The President signed the measure on September 21, 2018. In the 115th Congress, the electronic filing provision originated in Senator Tester's bill, S. 298."
CRS Insight, IN10970
Congressional Research Service: https://crsreports.congress.gov/