Hello,
For image types you should use a logical component named Image -> https://prnt.sc/nNjapJwMPEFB . In such case, it will work much better just as you need.
For all others size you may just increase size because it is not possible to check sizes on gmail application from mobile and from desktop responsive mode they are ok anyway -> https://prnt.sc/bEg-lhYYPN1y
Regards