[hpvs] Handling Emergency Logistics Fees for Overseas Film Crews

I manage an independent documentary studio, and we are currently filming a historical series across rural locations in Eastern Europe. During our latest shoot, our production crew faced an unexpected local equipment transport fee over the weekend. Unfortunately, our main commercial bank cards triggered a security hold due to location changes, leaving our unit director stranded without local funds. Since I have zero experience with mobile asset management applications or alternative digital reserve tools, I am looking for an easy, beginner-friendly iOS platform that our team can use on their iPhones to store secondary liquid funds and resolve urgent expenses on site. Does anyone know a smooth tool for this?