The Insignia 2-in-1 Handheld/Stick vacuum filter is prone to getting damaged with extensive use. The filter can rip, causing it not to catch debris, or it can clog up. In both cases, use this guide to change out the filter.
Push down the black button to release the dust cup.
Pull up and away from the handheld portion to remove.
Hold the bottom of the dustcup firmly and pull up and out to separate.
Repeat with the second filter.