hello,
to add a floppy img :
1/ get the process kvm vm command line
exemple: qm showcmd 107
2/ stop your vm
3/ copy and past command found in 1/ and add parameters :
"-drive file=/path/to/floppy.vdf,if=floppy,index=0"
it's boot your vm with floppy.vfd img attached to it
cyril