It depends. Sometimes they might notice if there are obvious signs or if they have a way of tracking such actions.
It's hard to say for sure. If they have certain monitoring tools or if your sending leaves some traces, they could potentially find out. But it also depends on how careful you are and the nature of the story.
Chapter 358, ", Heart of Stone", is the clearest early answer because it turns Imperial Tax's situation into a concrete plot event. The setup is That year, Thomlison was twenty-seven years old when Imperial Tax was..., but the pressure keeps building through His life had just started to improve, having formed a family with his....
Chapter 468, ", Reverse Beheading", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Again turning his head, the remaining two Terminators had already... and ending on Among them, three hundred Phoenix Warriors, led by Matins the Battle....
Chapter 501, ", Busier After Peace", is the clearest early answer because it turns Alliance's situation into a concrete plot event. It opens with People will resist, and unrest may arise; even if they don't openly... and closes on After the Green Tide, during the standoff between the Alliance and....
Chapter 438, ", I Am Not an Executioner", is the clearest early answer because the violence around Temir becomes final instead of hypothetical. It opens with In the void, aboard the Interlude Cruiser, Du Shiliang stared at the... and closes on Regarding Temir II, it was clear that the option to occupy the planet....
Chapter 484, "Confronting the Trial", is the clearest early answer because it turns Dragonhawk Star Domain's situation into a concrete plot event. The chapter turns that into something concrete by moving from The Silver Judges hadn't yet entered the Dragonhawk Star Domain, and... to How did the number of Phoenixes inflate to hundreds or thousands in....
Chapter 98, "Arrival!", is the clearest early answer because it turns Arrival's situation into a concrete plot event. It opens with Elder White Fang and Lord Terrace walked steadily toward the Soulor... and closes on I can ensure you get there quickly and without issue." White Fang.... The key payoff is that the chapter closes with The carriage rolled forward, the guards at the entrance stepping aside with deference as General Saph leaned out to announce their arrival.
Chapter 491, ", Identification", is the clearest early answer because it turns Military Affairs Department's situation into a concrete plot event. The setup is What Naldo Kero, I don't know this person." At the Supreme Council,..., but the pressure keeps building through Don't blame everything on Gu Hang, who knows if he has offended some....
Chapter 409, ", Atonement Expedition, Independent Kingdom", is the clearest early answer because it turns Phoenix Battle Group's situation into a concrete plot event. The chapter turns that into something concrete by moving from When Matins was escorting Blaywins and the other eight to Rage Owl... to Picking up eight old soldiers and saving a few thousand grace points....
Chapter 93, "Toward The Southern Atholor Continent IV", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from Wiiiinnnng~ The air shimmered and glowed as the teleportation array... to I can't sense anyone within a few hundred meters." Elder White Fang....
Chapter 459, ", Cruiser Technology!", is the clearest early answer because it turns Cruiser Technology's situation into a concrete plot event. It opens with In no time, merely half a year later, Gu Hang was able to see on the... and closes on The other part was the income from annihilating the Ashen Dead Squad,.... The key payoff is that the chapter closes with Ordinarily, Gu Hang needn't worry about the level elevation;