Toilet - push button not flushing

[Mojooo]

See pics and video

https://1drv.ms/f/s!AutS6uK5ubo1h59eBtKvhucJX0x-3Q
https://1drv.ms/v/s!AutS6uK5ubo1h59gqgTFkb2Zrn_iNQ

I have had this toilet for about 3 years and recently when you press the button to flush nothing happens and you have to keep pushing to make it work.

I note the tubes are quite long but it worked with them that long before. I did cut the ends off at the end where the circle button is incase the joints were loose

Its a concealed cistern so want to avoid taking anything out if I can.

Water levels have not changed AFAIK - its set to be maximum filled.

Any ideas?

[Mojooo]

Surely the toilet wouldn't flush just from blowing into it
hadnt occurred to me the buttons could be messed up - will have a closer look tonight.

[Mojooo]

OK managed to fix mine pretty easily

The tubes between the button and flush valve were quite long - probably 40-50 cm so I cut it down to about 15cm and it works - which suggests the button is knackered - new one ordered. The button did still output some air but obviously not enough.